>Date: Mon, 10 May 1999 13:13:30 -0600 >To: L.M.D.Cranswick@dl.ac.uk (L. Cranswick) >From: vondreele@popler.lansce.lanl.gov (Bob Von Dreele) >Subject: Re: Variable Step data and GSAS Query Assuming that the data is "constant" step data where the diffractometer can't make precisely the same step each time, this data can be read in "as-is" to GSAS. You need to use the "ALT" input format which reads in position, intensity & esd for each step. The position value is 32*centidegrees. This may seem odd but it was developed to read in the weird TOF steps generated by the ISIS data acquisition systems. On the "BANK" card use "CONST" for the step algorithm and enter the zero and step size in 32*centidegrees. The step should be the mean step size. Bob