Attenuate the beam and take many more frames such that you get a full dataset, 
albeit at slightly lower resolution, before the metals go away. In other words, 
reduce dose/degPhi.

JPK

From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of Dean 
Derbyshire
Sent: Wednesday, April 30, 2014 6:33 AM
To: CCP4BB@JISCMAIL.AC.UK
Subject: [ccp4bb] metals disapear

Hi all,
Has anyone experienced catalytic metal ions disappearing during data collection 
?
If so, is there a way of preventing it?
D.

   Dean Derbyshire
   Senior Research Scientist
[cid:image001.jpg@01CF6450.2D6A0D80]
   Box 1086
   SE-141 22 Huddinge
   SWEDEN
   Visit: Lunastigen 7
   Direct: +46 8 54683219
   www.medivir.com<http://www.medivir.com>

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