Since Sacha is having trouble posting directly the list I will
forward his latest message since It addresses my second set of
questions:
Begin forwarded message:
From: Alexandre OURJOUMTSEV <sa...@igbmc.fr>
Thank you, Richard, for your questions !
Unfortunately, I failed to pass my mail to the CCP4bb - I
discovered that I changed my e-mail address and completely forgot
to update my CCP4 subscription ! I asked Pavel Afonine re-send my
mail from his address.
Coming to your last questions :
- yes, eventually the sharper the map signal, the larger amount of
low-resolution 'long and low' waves you can take off keeping yet
the signal in the map; however, I do not have particular numbers .
- yes, in the 1991-year paper there is an example how low-
resolution data can be restored from the higher-resolution ones
(but still having experimental data is much better that go to a
risky business of data recovering)
- I am not completely sure if the strongest data are always the
lowest resolution one; I think due to the bulk-solvent contribution
this is not always the case (I recall the paper by Phillips, 1980 -
I think at his plot <Fobs> goes down near the origin).
- yes, having the magnitudes for the whole CONTINUOUS Fourier
transform (that means NOT from a crystal but from an aperiodic
object) allows one (in theory) to recover unambiguously the phases,
that people like Millane, Saxton et all try to do.
I hope this helps.
Be well !
Sacha
