File naming conventions

I shorten the SSC file names using the syntax and conventions below.

The file names come in two forms

target.ptgO.EEDD.type.fits (for uncoadded images and spectra)

target.ptg.MMON.type.fits (for coadded data)

• target is the name of the source, lower-case preferred, no spaces
• MM = module (sl, sh, ll, lh, lo for combined SL-LL, hi for SH-LH)
• O = order (1-2 for sl,ll, 0 for sh,lh)
  This is sometimes dropped for SH and LH.
• N = nod position (a or b)
• ptg = a,b,c, etc when we have multiple pointings to a single target
  This is sometimes dropped.
• EE = EXPID (reduced from 4 digits to 2)
• DD = DCENUM (reduced from 4 digits to 2)
• type = file type
  There are many file types. Here are the most common:
  • im = standard bcd image (final flatfielded SSC image)
  • ic = cleaned image
  • id = image difference (sky-subtracted)
  • fu = flatfield uncertainty image
  • bm = bmask (bitmask) image
  • dr = droop image (before removestraycross and flatfielding)
  • du = droop uncertainty image
  • sp = spectrum (spectral FITS file)
  • ap = spectrum produced by using spfnodjoin.pro
  • ac = cleaned ap spectrum
  • y = YAAAR-compatible FITS table file

Example of file names from one set of HR 6606 data through processing

• hr6606.b2.0300.id.fits - HR 6606, pointing b, SL order 2, EXPID 03, DCE 00, bcd image difference
• hr6606.b2.0300.sp.fits - Same, but now extracted
• hr6606.b.sl1b.sp.fits - Same, now co-added (if necessary) and calibrated, note "b" for Nod 2
• hr6606.b.sl.sp.fits - Same, data from both nods and SL apertures combined
• hr6606.b.lo.ac.fits - Same, but now out of the SL directory and combined with LL data

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Last modified 3 February, 2005. © The IRS Team.