GSAS: lessen the tedium: batch file control of the refinement :(EXPEDT Example: refine interstitial metal atoms - less vacancies)
k ! don't make a backup of the file
v 1:324 -x ! get rid of any X parameters refining
v 1:324 -u ! get rid of any UISO parameters refining
v 1:324 -f ! get rid of any FRAC parameters refining
v 133:144 x ! set interstitial Met to refine
v 147:154 x ! set interstitial Met to refine
v 157:162 x ! set interstitial Met to refine