Dear Yuri, The new program ANODE (J.Appl.Cryst. (2011) 44, 1285-7, Open Access) is designed for this and is very simple to use. It may be downloaded from the SHELX beta-test server (please email me if you require downloading intructions). George On 11/26/2011 06:05 AM, Yuri Pompeu wrote: > Hi Boaz, > Yes indeed, the phosphate group of the molecule looks quite beautiful at 1.17A and it has a really big peak 18sigma! > Is there a utility for calculating anomalous maps, or is it simply an option in the refinement program? >