PERFAC: Estimate Monochromator Perfection Factor

apply apply the following perfection factor ratios

PERFAC 1 min F value applied in the F ratios 5.0

2 max deviation from unity permitted for the F ratio 0.1

3 max 2θ considered for ratios all data

apply 1- up to 8 perfection factor ratios 0. .1 .25 .4 .6 .75 .9 1.