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Fig. 4


Count-rate image of the two NIRSpec detector arrays (SCA491 and SCA492) of an exposure of the argon lamp acquired with G140M and the MSA configured in a dashed slit pattern (see enlargement). In this case the dashed slits were open in Q3 and Q4. The apparent width of the lines depends on the image scaling and blending of unresolved pairs. The regular pattern of spectra is spoiled by the missing spectra due to shutters that fail to open, or by misaligned, overlapping spectra from shutters that cannot be closed (stuck open). The image was generated from NIRSpec raw data using our preprocessing pipeline.

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