This routine records scans, with the standard lamp on, at different step-numbers to collect the necessary data to determine the relationship bewteen the two spectrometers. RD_GS is used to reduce the data collected in the sgdddyy.### file to give the values of GS and GI needed.This routine records scans, with the standard lamp on, at different step-numbers to collect the necessary data to determine the relationship bewteen the two spectrometers. RD_GS is used to reduce the data collected in the sgdddyy.### file to give the values of GS and GI needed.