Look at the "reject fraction" keyword and increase the value, as described on pp 39-40 of the manual Pete
________________________________ From: CCP4 bulletin board [mailto:[EMAIL PROTECTED] On Behalf Of Mona Rahman Sent: Tuesday, July 15, 2008 7:14 AM To: CCP4BB@JISCMAIL.AC.UK Subject: [ccp4bb] Question re: ice rings in diffraction data Hello all, I have a query re: processing data. I have some lovely diffraction data that has been marred by ice rings (so...not as lovely as it could be). I was told it may be possible to mask the regions of the ice rings (obviously sacrificing completeness) during processing. I have been using HKL2000 to process data. Is this feature available with this program? Otherwise, we also have Mosfilm. Any advice would be greatly appreciated. Thank you. Sincerely in anticipation Mona Rahman --------------------------------------------------- Mona N. Rahman, Ph.D. Dept. of Biochemistry/Pharmacology & Toxicology Botterell Hall, Rooms 623 and 634 (lab) Queen's University, Kingston, ON, K7L 3N6 Phone: 613-533-2993, 613-533-6293 (lab) E-mail: [EMAIL PROTECTED]