Comparison of normalized image slices extracted from the 2015 51 Eri data set with our pipeline and the DRH/DC for two wavelengths: one at high S/N (top row) and one at low S/N (bottom row). Top row: at the peak of emission at around 1065 nm, shown in logarithmic scale. Bottom row: same for the channel with the lowest S/N, at around 1370 nm. From left to right: optimal extraction frame (YH-mode) in hexagonal geometry; the same frame resampled to rectilinear grid; DRH pipeline reduction with additional routines for crosstalk correction and wavelength correction from the SPHERE DC.