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Hi Rana, You probably have multiple options suggested to you. One is sftools using the CALC command. If the subtraction includes a phase then sftools can also do the calculation on the full structure factor. Plain subtraction of amplitudes ensuring the result is >= 0 READ yourfile.mtz CALC col fnew = col f1 col f2 - abs WRITE yournewfile.mtz Subtraction of structure factors CALC (col fnew pnew) = (col f1 p1) (col f2 p1) - f1, p1 etc are the column labels for amplitude and phase columns respectively. I recommend to run the program interactively and you can use CALC help to get more help. Bart Rana Refaey wrote: > Hi, > > I was wondering if anyone knows what programme I need to use to > subtract the Fobs of two different crystals from each other. > > Regards, > Rana > > ------------------------------------------------------------------------ > Invite your mail contacts to join your friends list with Windows Live > Spaces. It's easy! Try it! > <http://spaces.live.com/spacesapi.aspx?wx_action=create&wx_url=/friends.aspx&mkt=en-us>