SPECPR Users’ Manual Page 8-f25.1 F25: Two Component Areal Mix Least Squares Alias = twoc[omlsq] This special function computes the best areal mixture of two "known" spectra as compared to an observed spectrum. The user provides his or her own guess as to what the end-member spectra are and the routine computes the least squares fit of the two. WARNING: This routine was a developmental version at the University of Hawaii and has never been certified as to its method. It currently works for spectra without error bars and with channels less than or equal to 256. If you do use this routine, you must verify for yourself the accuracy of the method. A full manual entry is waiting on proper certification of this routine.