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Warnings related to missing SUM_2X2, OCLKPAIR, FEP_CCD, or ORC_MODE keywords
Users trying to run this tool with old versions of data products, those created with ASCDSVER less than version 8.4.2, may see warnings like
FITSIO status = 202: keyword not found in header *** ERROR: *** Unable to get the value of `SUM_2X2' in /data/acisf04425_000N003_evt1.fits
Users should consult the Watch Out page for more information on this topic an information on how to upgrade their data products.
Comments and units are not always clear
The comments and units of the output ARF file has some keyword and column that do not follow the standards (eg "sec" instead of "s" for seconds). The data values and keyword/column names are correct.