PixelCPETemplateReco.cc

Go to the documentation of this file.

// Include our own header first
#include "RecoLocalTracker/SiPixelRecHits/interface/PixelCPETemplateReco.h"

// Geometry services
#include "Geometry/TrackerGeometryBuilder/interface/PixelGeomDetUnit.h"
#include "Geometry/TrackerGeometryBuilder/interface/RectangularPixelTopology.h"

//#define DEBUG

// MessageLogger
#include "FWCore/MessageLogger/interface/MessageLogger.h"

// Magnetic field
#include "MagneticField/Engine/interface/MagneticField.h"

// The template header files
#include "RecoLocalTracker/SiPixelRecHits/interface/SiPixelTemplateReco.h"

// Commented for now (3/10/17) until we figure out how to resuscitate 2D template splitter

#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include <vector>
#include "boost/multi_array.hpp"

#include <iostream>

using namespace SiPixelTemplateReco;
//using namespace SiPixelTemplateSplit;
using namespace std;

namespace {
   constexpr float micronsToCm = 1.0e-4;
   constexpr int cluster_matrix_size_x = 13;
   constexpr int cluster_matrix_size_y = 21;
}

//-----------------------------------------------------------------------------
//  Constructor.
//
//-----------------------------------------------------------------------------
PixelCPETemplateReco::PixelCPETemplateReco(edm::ParameterSet const & conf,
                                           const MagneticField * mag,
                                           const TrackerGeometry& geom,
                                           const TrackerTopology& ttopo,
                                           const SiPixelLorentzAngle * lorentzAngle,
                                           const SiPixelTemplateDBObject * templateDBobject)
: PixelCPEBase(conf, mag, geom, ttopo, lorentzAngle, nullptr, templateDBobject, nullptr,1)
{
   //cout << endl;
   //cout << "Constructing PixelCPETemplateReco::PixelCPETemplateReco(...)................................................." << endl;
   //cout << endl;
   
   // Configurable parameters
   //DoCosmics_ = conf.getParameter<bool>("DoCosmics"); // Not used in templates
   //LoadTemplatesFromDB_ = conf.getParameter<bool>("LoadTemplatesFromDB"); // Moved to Base
   
   //cout << " PixelCPETemplateReco : (int)LoadTemplatesFromDB_ = " << (int)LoadTemplatesFromDB_ << endl;
   //cout << "field_magnitude = " << field_magnitude << endl;
   
   // configuration parameter to decide between DB or text file template access
   
   if ( LoadTemplatesFromDB_ )
   {
      //cout << "PixelCPETemplateReco: Loading templates from database (DB) --------- " << endl;
      
      // Initialize template store to the selected ID [Morris, 6/25/08]
      if ( !SiPixelTemplate::pushfile( *templateDBobject_, thePixelTemp_) )
         throw cms::Exception("PixelCPETemplateReco")
         << "\nERROR: Templates not filled correctly. Check the sqlite file. Using SiPixelTemplateDBObject version "
         << (*templateDBobject_).version() << "\n\n";
   }
   else
   {
      //cout << "PixelCPETemplateReco : Loading templates for barrel and forward from ASCII files ----------" << endl;
      barrelTemplateID_  = conf.getParameter<int>( "barrelTemplateID" );
      forwardTemplateID_ = conf.getParameter<int>( "forwardTemplateID" );
      templateDir_       = conf.getParameter<int>( "directoryWithTemplates" );
     
      if ( !SiPixelTemplate::pushfile( barrelTemplateID_  , thePixelTemp_ , templateDir_ ) )
         throw cms::Exception("PixelCPETemplateReco")
     << "\nERROR: Template ID " << barrelTemplateID_ << " not loaded correctly from text file. Reconstruction will fail.\n\n";
      
      if ( !SiPixelTemplate::pushfile( forwardTemplateID_ , thePixelTemp_ , templateDir_ ) )
         throw cms::Exception("PixelCPETemplateReco")
     << "\nERROR: Template ID " << forwardTemplateID_ << " not loaded correctly from text file. Reconstruction will fail.\n\n";
   }
   
   speed_ = conf.getParameter<int>( "speed");
   LogDebug("PixelCPETemplateReco::PixelCPETemplateReco:") <<
   "Template speed = " << speed_ << "\n";
   
   UseClusterSplitter_ = conf.getParameter<bool>("UseClusterSplitter");
   
}

//-----------------------------------------------------------------------------
//  Clean up.
//-----------------------------------------------------------------------------
PixelCPETemplateReco::~PixelCPETemplateReco()
{
   for(auto x : thePixelTemp_) x.destroy();
}

PixelCPEBase::ClusterParam* PixelCPETemplateReco::createClusterParam(const SiPixelCluster & cl) const
{
   return new ClusterParamTemplate(cl);
}


//------------------------------------------------------------------
//  Public methods mandated by the base class.
//------------------------------------------------------------------

//------------------------------------------------------------------
//  The main call to the template code.
//------------------------------------------------------------------
LocalPoint
PixelCPETemplateReco::localPosition(DetParam const & theDetParam, ClusterParam & theClusterParamBase) const
{
   
   ClusterParamTemplate & theClusterParam = static_cast<ClusterParamTemplate &>(theClusterParamBase);
   
   if(!GeomDetEnumerators::isTrackerPixel(theDetParam.thePart))
      throw cms::Exception("PixelCPETemplateReco::localPosition :")
      << "A non-pixel detector type in here?";
   //  barrel(false) or forward(true)
   const bool fpix = GeomDetEnumerators::isEndcap(theDetParam.thePart);
   
   int ID = -9999;
   if ( LoadTemplatesFromDB_ ) {
      int ID0 = templateDBobject_->getTemplateID(theDetParam.theDet->geographicalId()); // just to comapre
      ID = theDetParam.detTemplateId;
      if(ID0!=ID) edm::LogError("PixelCPETemplateReco") <<" different id"<< ID<<" "<<ID0<<endl;
   } else { // from asci file
      if ( !fpix )
    ID = barrelTemplateID_  ; // barrel
      else
    ID = forwardTemplateID_ ; // forward
   }
   //cout << "PixelCPETemplateReco : ID = " << ID << endl;
   
   SiPixelTemplate templ(thePixelTemp_);
   
   // Preparing to retrieve ADC counts from the SiPixeltheClusterParam.theCluster->  In the cluster,
   // we have the following:
   //   int minPixelRow(); // Minimum pixel index in the x direction (low edge).
   //   int maxPixelRow(); // Maximum pixel index in the x direction (top edge).
   //   int minPixelCol(); // Minimum pixel index in the y direction (left edge).
   //   int maxPixelCol(); // Maximum pixel index in the y direction (right edge).
   // So the pixels from minPixelRow() will go into clust_array_2d[0][*],
   // and the pixels from minPixelCol() will go into clust_array_2d[*][0].
   
   int row_offset = theClusterParam.theCluster->minPixelRow();
   int col_offset = theClusterParam.theCluster->minPixelCol();
   
   // Store the coordinates of the center of the (0,0) pixel of the array that
   // gets passed to PixelTempReco1D
   // Will add these values to the output of  PixelTempReco1D
   float tmp_x = float(row_offset) + 0.5f;
   float tmp_y = float(col_offset) + 0.5f;
   
   // Store these offsets (to be added later) in a LocalPoint after tranforming
   // them from measurement units (pixel units) to local coordinates (cm)
   
   // ggiurgiu@jhu.edu 12/09/2010 : update call with trk angles needed for bow/kink corrections
   LocalPoint lp;
   
   if ( theClusterParam.with_track_angle )
      lp = theDetParam.theTopol->localPosition( MeasurementPoint(tmp_x, tmp_y), theClusterParam.loc_trk_pred );
   else
   {
      edm::LogError("PixelCPETemplateReco")
      << "@SUB = PixelCPETemplateReco::localPosition"
      << "Should never be here. PixelCPETemplateReco should always be called with track angles. This is a bad error !!! ";
      
      lp = theDetParam.theTopol->localPosition( MeasurementPoint(tmp_x, tmp_y) );
   }
   
   // first compute matrix size
   int mrow=0, mcol=0;
   for (int i=0 ; i!=theClusterParam.theCluster->size(); ++i )
   {
      auto pix = theClusterParam.theCluster->pixel(i);
      int irow = int(pix.x);
      int icol = int(pix.y);
      mrow = std::max(mrow,irow);
      mcol = std::max(mcol,icol);
   }
   mrow -= row_offset; mrow+=1; mrow = std::min(mrow,cluster_matrix_size_x);
   mcol -= col_offset; mcol+=1; mcol = std::min(mcol,cluster_matrix_size_y);
   assert(mrow>0); assert(mcol>0);
   
   float clustMatrix[mrow][mcol];
   memset(clustMatrix,0,sizeof(float)*mrow*mcol);
   
   // Copy clust's pixels (calibrated in electrons) into clusMatrix;
   for (int i=0 ; i!=theClusterParam.theCluster->size(); ++i )
   {
      auto pix = theClusterParam.theCluster->pixel(i);
      int irow = int(pix.x) - row_offset;
      int icol = int(pix.y) - col_offset;
      
      // Gavril : what do we do here if the row/column is larger than cluster_matrix_size_x/cluster_matrix_size_y  ?
      // Ignore them for the moment...
      if ( (irow<mrow) & (icol<mcol) ) clustMatrix[irow][icol] =  float(pix.adc);
      
   }
   
   
   // Make and fill the bool arrays flagging double pixels
   bool xdouble[mrow], ydouble[mcol];
   // x directions (shorter), rows
   for (int irow = 0; irow < mrow; ++irow)
      xdouble[irow] = theDetParam.theRecTopol->isItBigPixelInX( irow+row_offset );
   
   // y directions (longer), columns
   for (int icol = 0; icol < mcol; ++icol)
      ydouble[icol] = theDetParam.theRecTopol->isItBigPixelInY( icol+col_offset );
   
   SiPixelTemplateReco::ClusMatrix clusterPayload{&clustMatrix[0][0], xdouble, ydouble, mrow,mcol};
   
   // Output:
   float nonsense = -99999.9f; // nonsense init value
   theClusterParam.templXrec_ = theClusterParam.templYrec_ = theClusterParam.templSigmaX_ = theClusterParam.templSigmaY_ = nonsense;
   // If the template recontruction fails, we want to return 1.0 for now
   theClusterParam.templProbY_ = theClusterParam.templProbX_ = theClusterParam.templProbQ_ = 1.0f;
   theClusterParam.templQbin_ = 0;
   // We have a boolean denoting whether the reco failed or not
   theClusterParam.hasFilledProb_ = false;
   
   float templYrec1_ = nonsense;
   float templXrec1_ = nonsense;
   float templYrec2_ = nonsense;
   float templXrec2_ = nonsense;
   
   // ******************************************************************
   // Do it! Use cotalpha_ and cotbeta_ calculated in PixelCPEBase
   
   
   float locBz = theDetParam.bz;
   float locBx = theDetParam.bx;
   
   theClusterParam.ierr =
   PixelTempReco1D( ID, theClusterParam.cotalpha, theClusterParam.cotbeta,
                   locBz, locBx,
                   clusterPayload,
                   templ,
                   theClusterParam.templYrec_, theClusterParam.templSigmaY_, theClusterParam.templProbY_,
                   theClusterParam.templXrec_, theClusterParam.templSigmaX_, theClusterParam.templProbX_,
                   theClusterParam.templQbin_,
                   speed_,
                   theClusterParam.templProbQ_
                   );
   
   // ******************************************************************
   
   // Check exit status
   if UNLIKELY( theClusterParam.ierr != 0 )
   {
      LogDebug("PixelCPETemplateReco::localPosition") <<
      "reconstruction failed with error " << theClusterParam.ierr << "\n";
      
      // Gavril: what do we do in this case ? For now, just return the cluster center of gravity in microns
      // In the x case, apply a rough Lorentz drift average correction
      // To do: call PixelCPEGeneric whenever PixelTempReco1D fails
      float lorentz_drift = -999.9;
      if ( !fpix )
         lorentz_drift = 60.0f; // in microns
      else
         lorentz_drift = 10.0f; // in microns
      // ggiurgiu@jhu.edu, 21/09/2010 : trk angles needed to correct for bows/kinks
      if ( theClusterParam.with_track_angle )
      {
         theClusterParam.templXrec_ = theDetParam.theTopol->localX( theClusterParam.theCluster->x(), theClusterParam.loc_trk_pred ) - lorentz_drift * micronsToCm; // rough Lorentz drift correction
         theClusterParam.templYrec_ = theDetParam.theTopol->localY( theClusterParam.theCluster->y(), theClusterParam.loc_trk_pred );
      }
      else
      {
         edm::LogError("PixelCPETemplateReco")
         << "@SUB = PixelCPETemplateReco::localPosition"
         << "Should never be here. PixelCPETemplateReco should always be called with track angles. This is a bad error !!! ";
         
         theClusterParam.templXrec_ = theDetParam.theTopol->localX( theClusterParam.theCluster->x() ) - lorentz_drift * micronsToCm; // rough Lorentz drift correction
         theClusterParam.templYrec_ = theDetParam.theTopol->localY( theClusterParam.theCluster->y() );
      }
   }
   else if UNLIKELY( UseClusterSplitter_ && theClusterParam.templQbin_ == 0 )
   {
      cout << " PixelCPETemplateReco : We should never be here !!!!!!!!!!!!!!!!!!!!!!" << endl;
      cout << "                 (int)UseClusterSplitter_ = " << (int)UseClusterSplitter_ << endl;
      
      //ierr =
      //PixelTempSplit( ID, fpix, cotalpha_, cotbeta_,
      //        clust_array_2d, ydouble, xdouble,
      //        templ,
      //        templYrec1_, templYrec2_, templSigmaY_, templProbY_,
      //        templXrec1_, templXrec2_, templSigmaX_, templProbX_,
      //        templQbin_ );
      

      // Commented for now (3/10/17) until we figure out how to resuscitate 2D template splitter
      
      theClusterParam.ierr = -123;
      /*
       float dchisq;
       float templProbQ_;
       SiPixelTemplateSplit::PixelTempSplit( ID, theClusterParam.cotalpha, theClusterParam.cotbeta,
       clust_array_2d,
       ydouble, xdouble,
       templ,
       templYrec1_, templYrec2_, theClusterParam.templSigmaY_, theClusterParam.templProbY_,
       templXrec1_, templXrec2_, theClusterParam.templSigmaX_, theClusterParam.templProbX_,
       theClusterParam.templQbin_,
       templProbQ_,
       true,
       dchisq,
       templ2D_ );
       
       */
      if ( theClusterParam.ierr != 0 )
      {
         LogDebug("PixelCPETemplateReco::localPosition") <<
         "reconstruction failed with error " << theClusterParam.ierr << "\n";
         
         // Gavril: what do we do in this case ? For now, just return the cluster center of gravity in microns
         // In the x case, apply a rough Lorentz drift average correction
         // To do: call PixelCPEGeneric whenever PixelTempReco1D fails
         float lorentz_drift = -999.9f;
         if ( !fpix )
            lorentz_drift = 60.0f; // in microns
         else
            lorentz_drift = 10.0f; // in microns
         
         // ggiurgiu@jhu.edu, 12/09/2010 : trk angles needed to correct for bows/kinks
         if ( theClusterParam.with_track_angle )
         {
            theClusterParam.templXrec_ = theDetParam.theTopol->localX( theClusterParam.theCluster->x(),theClusterParam.loc_trk_pred ) - lorentz_drift * micronsToCm; // rough Lorentz drift correction
            theClusterParam.templYrec_ = theDetParam.theTopol->localY( theClusterParam.theCluster->y(),theClusterParam.loc_trk_pred );
         }
         else
         {
            edm::LogError("PixelCPETemplateReco")
            << "@SUB = PixelCPETemplateReco::localPosition"
            << "Should never be here. PixelCPETemplateReco should always be called with track angles. This is a bad error !!! ";
            
            theClusterParam.templXrec_ = theDetParam.theTopol->localX( theClusterParam.theCluster->x() ) - lorentz_drift * micronsToCm; // very rough Lorentz drift correction
            theClusterParam.templYrec_ = theDetParam.theTopol->localY( theClusterParam.theCluster->y() );
            
         }
      }
      else
      {
         // go from micrometer to centimeter
         templXrec1_ *= micronsToCm;
         templYrec1_ *= micronsToCm;
         templXrec2_ *= micronsToCm;
         templYrec2_ *= micronsToCm;
         
         // go back to the module coordinate system
         templXrec1_ += lp.x();
         templYrec1_ += lp.y();
         templXrec2_ += lp.x();
         templYrec2_ += lp.y();
         
         // calculate distance from each hit to the track and choose the hit closest to the track
         float distX1 = std::abs (templXrec1_ - theClusterParam.trk_lp_x);
         float distX2 = std::abs (templXrec2_ - theClusterParam.trk_lp_x);
         float distY1 = std::abs (templYrec1_ - theClusterParam.trk_lp_y);
         float distY2 = std::abs (templYrec2_ - theClusterParam.trk_lp_y);
         theClusterParam.templXrec_ = (distX1<distX2? templXrec1_ : templXrec2_);
         theClusterParam.templYrec_ = (distY1<distY2? templYrec1_ : templYrec2_);
      }
   } // else if ( UseClusterSplitter_ && templQbin_ == 0 )
   
   else // apparenly this is the good one!
   {
      // go from micrometer to centimeter
      theClusterParam.templXrec_ *= micronsToCm;
      theClusterParam.templYrec_ *= micronsToCm;
      
      // go back to the module coordinate system
      theClusterParam.templXrec_ += lp.x();
      theClusterParam.templYrec_ += lp.y();
      
      // Compute the Alignment Group Corrections [template ID should already be selected from call to reco procedure]
      if ( DoLorentz_ ) {
         // Do only if the lotentzshift has meaningfull numbers
         if( theDetParam.lorentzShiftInCmX!= 0.0 ||  theDetParam.lorentzShiftInCmY!= 0.0 ) {
            // the LA width/shift returned by templates use (+)
            // the LA width/shift produced by PixelCPEBase for positive LA is (-)
            // correct this by iserting (-)
            //float temp1 = -micronsToCm*templ.lorxwidth();  // old
            //float temp2 = -micronsToCm*templ.lorywidth();  // does not incl 1/2
            float templateLorbiasCmX = -micronsToCm*templ.lorxbias();  // new
            float templateLorbiasCmY = -micronsToCm*templ.lorybias(); //incl. 1/2
            // now, correctly, we can use the difference of shifts
            //theClusterParam.templXrec_ += 0.5*(theDetParam.lorentzShiftInCmX - templateLorbiasCmX);
            //theClusterParam.templYrec_ += 0.5*(theDetParam.lorentzShiftInCmY - templateLorbiasCmY);
            theClusterParam.templXrec_ += (0.5*(theDetParam.lorentzShiftInCmX) - templateLorbiasCmX);
            theClusterParam.templYrec_ += (0.5*(theDetParam.lorentzShiftInCmY) - templateLorbiasCmY);
            //cout << "Templates: la lorentz offset = "
            //   <<(0.5*(theDetParam.lorentzShiftInCmX)-templateLorbiasCmX)
            //   <<" "<<templateLorbiasCmX<<" "<<templateLorbiasCmY
            //   <<" "<<temp1<<" "<<temp2
            //   <<" "<<theDetParam.lorentzShiftInCmX
            //   <<" "<<theDetParam.lorentzShiftInCmY
            //   << endl; //dk
         } //else {cout<<" LA is 0, disable offset corrections "<<endl;} //dk
      } //else {cout<<" Do not do LA offset correction "<<endl;} //dk
      
   }
   
   // Save probabilities and qBin in the quantities given to us by the base class
   // (for which there are also inline getters).  &&& templProbX_ etc. should be retired...
   theClusterParam.probabilityX_  = theClusterParam.templProbX_;
   theClusterParam.probabilityY_  = theClusterParam.templProbY_;
   theClusterParam.probabilityQ_  = theClusterParam.templProbQ_;
   theClusterParam.qBin_          = theClusterParam.templQbin_;
   
   if ( theClusterParam.ierr == 0 ) // always true here
      theClusterParam.hasFilledProb_ = true;
   
   return LocalPoint( theClusterParam.templXrec_, theClusterParam.templYrec_ );
   
}

//------------------------------------------------------------------
//  localError() relies on localPosition() being called FIRST!!!
//------------------------------------------------------------------
LocalError
PixelCPETemplateReco::localError(DetParam const & theDetParam,  ClusterParam & theClusterParamBase) const
{
   
   ClusterParamTemplate & theClusterParam = static_cast<ClusterParamTemplate &>(theClusterParamBase);
   
   //cout << endl;
   //cout << "Set PixelCPETemplate errors .............................................." << endl;
   
   //cout << "CPETemplate : " << endl;
   
   //--- Default is the maximum error used for edge clusters.
   //--- (never used, in fact: let comment it out, shut up the complains of the static analyzer, and save a few CPU cycles)
   //   const float sig12 = 1./sqrt(12.0);
   //   float xerr = theDetParam.thePitchX *sig12;
   //   float yerr = theDetParam.thePitchY *sig12;
   float xerr, yerr;
   
   // Check if the errors were already set at the clusters splitting level
   if ( theClusterParam.theCluster->getSplitClusterErrorX() > 0.0f && theClusterParam.theCluster->getSplitClusterErrorX() < 7777.7f &&
       theClusterParam.theCluster->getSplitClusterErrorY() > 0.0f && theClusterParam.theCluster->getSplitClusterErrorY() < 7777.7f )
   {
      xerr = theClusterParam.theCluster->getSplitClusterErrorX() * micronsToCm;
      yerr = theClusterParam.theCluster->getSplitClusterErrorY() * micronsToCm;
      
      //cout << "Errors set at cluster splitting level : " << endl;
      //cout << "xerr = " << xerr << endl;
      //cout << "yerr = " << yerr << endl;
   }
   else
   {
      // If errors are not split at the cluster splitting level, set the errors here
      
      //cout  << "Errors are not split at the cluster splitting level, set the errors here : " << endl;
      
      int maxPixelCol = theClusterParam.theCluster->maxPixelCol();
      int maxPixelRow = theClusterParam.theCluster->maxPixelRow();
      int minPixelCol = theClusterParam.theCluster->minPixelCol();
      int minPixelRow = theClusterParam.theCluster->minPixelRow();
      
      //--- Are we near either of the edges?
      bool edgex = ( theDetParam.theRecTopol->isItEdgePixelInX( minPixelRow ) || theDetParam.theRecTopol->isItEdgePixelInX( maxPixelRow ) );
      bool edgey = ( theDetParam.theRecTopol->isItEdgePixelInY( minPixelCol ) || theDetParam.theRecTopol->isItEdgePixelInY( maxPixelCol ) );
      
      if ( theClusterParam.ierr !=0 )
      {
         // If reconstruction fails the hit position is calculated from cluster center of gravity
         // corrected in x by average Lorentz drift. Assign huge errors.
         //xerr = 10.0 * (float)theClusterParam.theCluster->sizeX() * xerr;
         //yerr = 10.0 * (float)theClusterParam.theCluster->sizeX() * yerr;
         
         if(!GeomDetEnumerators::isTrackerPixel(theDetParam.thePart))
            throw cms::Exception("PixelCPETemplateReco::localPosition :")
            << "A non-pixel detector type in here?";
         
         // Assign better errors based on the residuals for failed template cases
         if ( GeomDetEnumerators::isBarrel(theDetParam.thePart) )
         {
            xerr = 55.0f * micronsToCm;
            yerr = 36.0f * micronsToCm;
         }
         else
         {
            xerr = 42.0f * micronsToCm;
            yerr = 39.0f * micronsToCm;
         }
         
         //cout << "xerr = " << xerr << endl;
         //cout << "yerr = " << yerr << endl;
         
         //return LocalError(xerr*xerr, 0, yerr*yerr);
      }
      else if ( edgex || edgey )
      {
         // for edge pixels assign errors according to observed residual RMS
         if      ( edgex && !edgey )
         {
            xerr = 23.0f * micronsToCm;
            yerr = 39.0f * micronsToCm;
         }
         else if ( !edgex && edgey )
         {
            xerr = 24.0f * micronsToCm;
            yerr = 96.0f * micronsToCm;
         }
         else if ( edgex && edgey )
         {
            xerr = 31.0f * micronsToCm;
            yerr = 90.0f * micronsToCm;
         }
         else
         {
            throw cms::Exception(" PixelCPETemplateReco::localError: Something wrong with pixel edge flag !!!");
         }
         
         //cout << "xerr = " << xerr << endl;
         //cout << "yerr = " << yerr << endl;
      }
      else 
      {
         // &&& need a class const
         //const float micronsToCm = 1.0e-4;
         
         xerr = theClusterParam.templSigmaX_ * micronsToCm;
         yerr = theClusterParam.templSigmaY_ * micronsToCm;
         
         //cout << "xerr = " << xerr << endl;
         //cout << "yerr = " << yerr << endl;
         
         // &&& should also check ierr (saved as class variable) and return
         // &&& nonsense (another class static) if the template fit failed.
      }       
      
      if (theVerboseLevel > 9) 
      {
         LogDebug("PixelCPETemplateReco") <<
         " Sizex = " << theClusterParam.theCluster->sizeX() << " Sizey = " << theClusterParam.theCluster->sizeY() << " Edgex = " << edgex << " Edgey = " << edgey << 
         " ErrX  = " << xerr            << " ErrY  = " << yerr;
      }
      
   } // else
   
   if ( !(xerr > 0.0f) )
      throw cms::Exception("PixelCPETemplateReco::localError") 
      << "\nERROR: Negative pixel error xerr = " << xerr << "\n\n";
   
   if ( !(yerr > 0.0f) )
      throw cms::Exception("PixelCPETemplateReco::localError") 
      << "\nERROR: Negative pixel error yerr = " << yerr << "\n\n";
   
   //cout << "Final errors set to: " << endl;
   //cout << "xerr = " << xerr << endl;
   //cout << "yerr = " << yerr << endl;
   //cout << "Out of PixelCPETemplateREco..........................................................................." << endl;
   //cout << endl;
   
   return LocalError(xerr*xerr, 0, yerr*yerr);
}