void linearFit(T const *__restrict__ x, T const *__restrict__ y, int ndat, T const *__restrict__ sigy2, T &slope, T &intercept, T &covss, T &covii, T &covsi)
RZLine(const std::array< float, N > &r, const std::array< float, N > &z, const std::array< float, N > &errZ)