Comments (5)
This is a mystery to me. The sframe looks great. THRUFRAC is very low on P7, but with low calibration RMS, and somehow the low THRUFRAC doesn't result in low EFFTIME or the petal being thrown out.
https://data.desi.lbl.gov/desi/spectro/redux/daily/tiles/cumulative/24211/20220125/tile-qa-24211-thru20220125.png
Something is wrong with P7, but I haven't seen this before.
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The flux calibration in b7 is completely wrong, so wrong that this generates a step in the output spectra. This is a rare failure not seen before.
plot_frame -i ~/redux/daily/exposures/20220125/00120202/cframe-*7-00120202.fits --std --rebin 10
The tile QA is correctly reporting this issue.
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Fixed in desihub/desispec#1667
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Files reprocessed and tables updated. Back to Eddie for QA/specstatus
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Now marked as good, closing.
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Related Issues (20)
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- Lower than average good redshift statistics in petal 1 on 20230414; several tiles marked unsure. HOT 12
- Low-efftime fibers in petal 1 around 20230415 HOT 7
- Tile 20634 on 2023-04-29 rejects all petal 8 HOT 4
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- Tile 7741 from 2023-04-16 was never reduced HOT 8
- Tile 7471 on 20230512 has a serie ~30 dubious redshifts HOT 6
- Tileid=4542 has a suspicious accumulation of z~0.9328 redshifts HOT 2
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