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