HETG-ACIS-S "Chip Gaps"-Update, Oct.'99

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Conclusion The new pix_corner_lsi.par file is working well, producing plus-minus agreements in wavelength at or less than 1/2 a pixel. That is

   for MEG:    | Lambda_plus - Lambda_minus | =< 0.0055 A 
   for HEG:    | Lambda_plus - Lambda_minus | =< 0.0028 A 
Further, the zero-order offset of about 0.42 pixels, seen between HEG and MEG is not repeatable and for now it is best not to include an HEG-MEG offset in routine wavelength calculation (or use values of 0.0). It is still something to keep in mind, however, when comparing plus and minus wavelengths.

Please send any comments to Dan Dewey at dd@space.mit.edu.