Rana, to a large extent this depends on what you what to do with the
delta-F's afterwards (you didn't say). If all you want to do is
calculate a map, Patterson or Fourier, (which is probably what we do
most of the time with delta-F's) then you don't need to calculate the
difference as a separate step, the FFT input routine will do it for you,
also applying an appropriate phase if required. Or even if you want to
say calculate normalised moduli of the differences for direct methods,
again the ECALC program will calculate the difference before doing the
normalisation. It goes without saying that subtracting F's is pretty
meaningless if they are not on the same scale, and any relative B factor
has been taken out as well.
-- Ian
> -----Original Message-----
> From: [log in to unmask]
> [mailto:[log in to unmask]] On Behalf Of Rana Refaey
> Sent: 29 January 2009 14:36
> To: [log in to unmask]
> Subject: Fobs - Fobs
>
> 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
>
>
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