There are no easy answers for difficult problems, but have a look at
A. Gonzalez, J. Synchrotron Rad. (2007). 14, 43-50 

Hopefully some of the tips given there can help in your case.

On Thu, 15 Mar 2007, Yi Xue wrote:

YX >     Thus, basically, the Cu anomallous signal is very weak, and the
YX >crystals are kind of sensitive to radiation, it is dying but not that fast.
YX >     I am wondering,  Do we stand any chances to solve the phases by Cu MAD
YX >or SAD?


-- 
Be careful about reading health books. You may die of a misprint.
        --Mark Twain

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