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Update customize_calcos.rst
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Small changes in the text.
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marijana777 authored Oct 20, 2021
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Expand Up @@ -115,14 +115,14 @@ Follow the steps below for each segment (a, b) separately.
3) Customize and run CALCOS (1st Pass)
======================================

(a) Original Notes
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(a) Original Notes (with small modification)
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- **cd folder_with_raw_data**

- **For all FUV data set the following CALCOS calibration switches within pyraf:**

thedit *rawtag*.fits[0] FLATCORR 'OMIT' [flatfielding of Poisson data creates fractional counts, which are hard to interpret, COS flatfielding is approximate anyhow]
thedit *rawtag*.fits[0] FLATCORR 'OMIT' [flatfielding of Poisson data creates fractional counts, which are hard to interpret; also, COS flatfielding is approximate]

thedit *rawtag*.fits[0] PHACORR 'OMIT' [initial setting, to be tuned later]

Expand All @@ -132,10 +132,10 @@ Follow the steps below for each segment (a, b) separately.

- **Set your calibration files wisely:**

thedit *rawtag*.fits[0] SPOTTAB 'N/A' [This calibration step only works on select datasets where hotspots have been identified. How and by whom? Better get rid of this nonsense.]
thedit *rawtag*.fits[0] SPOTTAB 'N/A' [This calibration step only works on select datasets where hotspots have been identified. We will not use it.]

thedit *rawtag*.fits[0] GSAGTAB 'lref$x6l1439el_gsag.fits' [This will flag all gain sag holes as of 2013Jun20, so mainly geocoronal gain sag holes at the overused LP1.
Keeps the LP1 and LP2 traces usable that partly overlap with the dark calibration regions. All this is safe and tested!
Keeps the LP1 and LP2 traces usable that partly overlap with the dark calibration regions. All this is safe and tested.
Download this file from https://hst-crds.stsci.edu.]

thedit *rawtag*.fits[0] XTRACTAB 'lref$x6q17586l_1dx.fits' [This will work for LP2 data with CALCOS v2.21. In newer versions STScI renamed some columns, so they might not work with CALCOS v2.21.
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