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A2: The 1238 delivery updates MIRI MRS flatfield and photometric calibration reference files, but not aware of any new masking (see https://jwst-crds.stsci.edu/). The NAN pixels appear to be perfectly aligned with your targets, so we think something else might be going on. Please send us a Help Desk ticket with your Program ID number and appropriate screens shots so we can investigate further.
DRL update: On digging into this I think the issue is with calwebb_detector1. The relevant line is ultra-bright, and it looks like the CR shower algorithm is mistaking it for the core of a cosmic ray shower and flagging sections of the source around it. This would only affect offline reprocessing since the showers code is OFF by default for MRS. This would be unaffected by reference file updates though, so unclear why the pmaps above made a difference.
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Q3: In my MIRI MRS data (of 3 galaxies) there is a noticeable absorption feature on the sides of the Ar II emission line at 7 microns. This feature is present in all of my data across the cubes, is this real or perhaps a detector artifact? The Ar II line is very bright, especially in channel 1, but not brighter than other emission lines in my data.
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