Dear Mohamed and Herman, As regards the ice rings, I have already eliminated them when I processed data by using XDS. I apologize for the Aimless log file I sent you, but my unix computer is out of order and I have only my windows laptop. I processed data again by Mosflm after first Mohamed e-mail, but it has been the first time I used Mosflm and I forgot to put the option for excluding ice rings. I have tried to refine the structure by cutting the resolution range up to 2.0 angstrom but nothing significant happens (attached image). Thank you Francesco