Strange Fo-Fc map

[Anonymous]

In article <348563C0.41C6 at btk.utu.fi>, Vesa Tuominen O_GOLD
<Vesa.Tuominen at btk.utu.fi> wrote:

> Hello!
> 
> I have strange Fo-Fc map, where are several parallel + and - density
> lines. The resolution of our data is about 2.1 and we have solved
> structure to about 2.1. R is about 19 % and Rfree 24 %. Everything looks
> good exept our Fo-Fc map.

Are you using x-plor online? are you calculating sigmaA weighted maps? If
so there was an error in some of the distributed scripts for map
calculations. If that is the case let me know and I will dig into my
scripts to find both the wrong and the correct one.