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updated XRT CCD contamination layer files

Dear XRT user,

We have updated the CCD contamination layer file; it is now current
up to 19-Feb-2010.  Our intention is to update the file regularly
after bake-outs.  An improved analysis was used to recompute the
layer thickness; users will note some changes in the computed
thicknesses for times before 08-Sep-2007.

Questions, comments to xrt_manager@head.cfa.harvard.edu

best wishes,

steve saar