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Spectrum from 20210107 has poor sky subtraction.
`plot_spectra -i /global/project/projectdirs/desi/spectro/redux/denali/tiles/pernight/80646/*/coadd-0-80646-*.fits -t 39628500788842368 --rebin 4`…
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Create a module to perform sky subtraction on the SCI1, SCI2, and SCI3 spectra using the SKY spectrum in the same frame. The sky spectrum to be subtracted might be a scaled copy of the SKY spectrum o…
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The sky subtraction step of the pipeline has a widely varying runtime, likely due to an iterative algorithm and varying data quality.
The plot below shows the median runtime of the sky subtraction …
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Right now sky subtraction works very locally, pixels right above/below the aperture trace.
Since wavelength space is bent/tilted, not perfectly vertical along y-axis, if you increase sky window sizes…
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- arose from #58
- investigating why patch boundaries are seen on stitching even with default pipeline
- these were uncovered when setting up Las Vegas 360 sphere.
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After running PESSTOSOFIPHOT for the old SN2013ak data set the sky subtracted and merged images are full of artifacts. The raw science frames look fine. The bug is still under investigation?
![sn201…
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_Issue [JP-3647](https://jira.stsci.edu/browse/JP-3647) was created on JIRA by [Charles Proffitt](https://jira.stsci.edu/secure/ViewProfile.jspa?name=proffitt):_
When background subtraction is done…
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At the end of the sky subtraction fit, we could consider fitting for a residual spectral background per CCD amplifier, either a constant term or a linear function of wavelength and a polynomial functi…
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- [ ] basic sky subtraction
- [ ] Kelson, 2003, PASP 115
- [ ] Does ABBA-style sky subtraction in the NIR fall under basic imaging reduction?]