gsextract and GMOS longslit: How to extract spectra with flux errors

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    alejocosmico
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    I want to obtain GMOS long-slit spectra with flux errors. In gsextract, I set fl_vardq+, weights=variance, clean=yes, and this results in an extracted spectrum with BANDID1=spectrum, BANDID2=raw, and BANDID3=sigma, but the latter is just all zeros.

    I am using gsextract after I already have reduced the raw images, transformed to wavelength, subtracted sky, and calibrated for flux. Throughout all these steps I am keeping fl_vardq+ to propagate DQ and VAR extensions.

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