Correlation of center and
slope spectra

r (s, m)

r (m, e)

MET 0.998 0.996
MET in tablet formulation 0.996 0.998
REPA 0.999 0.997
REPA in tablet formulation 0.997 0.996
Table 1: Peak purity correlation results of MET and REPA in formulation at peak start, middle and end using PDA detector.