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XMM­Newton CCF Release Note
XMM­CCF­REL­0103
EPIC MOS Spectral Response Distribution
D Lumb
January 8, 2002
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
EMOS1 QUANTUMEF 0009.CCF 2000­01­01 QE CCDn NO
EMOS2 QUANTUMEF 0009.CCF 2000­01­01 QE CCDn NO
2 Changes
In previous versions, the CCD efficiency was defined within a region described by a POLYGON
function. The selectlib functionality can cause some inconsistency at the borders of such a region.
Therefore we changed the description to a BOX region, which is completely defined at its borders,
and additionally offers faster implementation.
3 Scientific Impact of this Update
Makes the caclulation of quantum efficiency more robust at CCD edges.
1

XMM­Newton CCF Release XMM­CCF­REL­0103 Page: 2
4 Estimated Scientific Quality
5 Expected Updates
When we can characterise the change in CCD QE as a function of location there may need to be
multiple regions for each chip. We note that this may cause a re­think on what region definition to
employ.