Thanks, Paul. I guess you are right, I did not pay attention to e/A3,
thanks!
jie
Paul Emsley wrote:
On 14/01/11 13:03, jy wrote:
Hi All,
I tried the "mask map" function in COOT to generate density map of
selected fragment. However, the map looked much better than the original
2Fo-Fc map.
:-)
For example, weak density now became strong density.
I would find that surprising.
Do compare things at the same e/A^3, not sigma.
I am wondering whether the mask map I generated using default is
actually a Fc map? is there a parameter setting to make it reflect the
true map?
The mask is just a bit mask, suppressing all density outside it. The
mask is generated by simply marking the grid points within 2.0A (by
default) of the atoms in the atom selection.
Also, is there a way to select non-continuous residues other than a
segment? or what is a better program to do the job?
This perhaps is a problem of mmdb atom selections more than anything
else, I think. Perhaps the interface should take multiple selection
strings (currently it doesn't of course).
So, as a work-around, if I wanted a map with anything other than (say)
//A/20-30 and //B/40-50 suppressed, I'd create two masked maps and add
them together.
I don't know much about other programs.
Paul.
