General description: spFrame contains the non-calibrated spectra from the red- or blue-half of a single exposure. It is structurally the same as spCFrame which contains the calibrated spectra, except for the wavelength solution in HDU 3: spFrame uses a compact trace-set structure format while spCFrame uses an evaluated image for the log10(wavelength) at each pixel for each fiber.
Naming convention: spFrame-cc-eeeeeeee.fits.gz
Approximate size: 30 MB compressed.
File type: FITS
Read by products: spec2d (plotsignal.pro, write_uros.pro, spframe_read.pro)
Written by products: spec2d (spplan1d.pro)
HDU structure
HDU #0 = Flux in flat fielded electrons [FLOAT]
HDU #1 = Inverse variance (1/sigma^2) for the above [FLOAT]
HDU #2 = Pixel mask [32-bit INT]
HDU #3 = Wavelength solution traceset in log-10 Angstroms (vacuum) [FLOAT]
HDU #4 = Wavelength dispersion in units of (10^(-4) log-10 wavelength)^(-1) [FLOAT]
(these are the same units as in the combined-spectrum spPlate file)
HDU #5 = Plug-map structure from plPlugMapM file [BINARY FITS TABLE]
HDU #6 = Sky flux in flat fielded electrons [FLOAT]
HDU #7 = X position on the CCD [FLOAT]
For more details, see spCFrame.