The products that come from combining Level 1 data are called Level 2, or post-BCD, or PBCD data. Table 6.7 is a list of the PBCD files delivered by the Spitzer Heritage Archive. Figure 6.2 is a cartoon illustrating the relationship between these files.
Table 6.7 PBCD Files Delivered.
Name
Description
Format
Channel (b)
Type (c)
Size (kb)
2dcoad.txt
List of coadd weights.
ASCII
0,1,2,3
A
< 1
bkmsk.fits
Mask file for bksub.fits.
128 × 128
16-bit int
0,2
P
< 37
bkspc.fits
Coadded, nod-subtracted spectrum, in Jy. See tablenote (a).
32-bit real
0,2
A
25
bksub.fits
For the low-resolution modules in Staring Mode, the co-added products of one nod are subtracted from those of the other to produce a sky-subtracted image (bksub.fits). This file (and bksub.tbl) should be treated with caution if the area is crowded or contains extended emission around the science target.
128 × 128
32-bit real
0,2
A
< 90
bksub.tbl
Coadded, nod-subtracted spectrum in Jy. This file (and bksub.fits) should be treated with caution if the area is crowded or contains extended emission around the science target. See tablenote (a).
ASCII
0,2
P
< 30
bkunc.fits
Uncertainty file for bksub.fits.
128 × 128
32-bit real
0,2
P
< 67
c2msk.fits
Mask file for coa2d.fits.
128 × 128
16-bit int
1,2,3,4
P
37
c2unc.fits
Uncertainty file for coa2d.fits.
128 × 128
32-bit real
0,1,2,3
P
67
coa2d.fits
In AORs with multiple cycles, DCEs at each telescope pointing are averaged to produce the coa2d.fits. The DCEs that contribute to each averaged product are listed in *inlist.txt.
128 × 128
32-bit real
0,1,2,3
P
< 90
ibsmk.txt
List of bmask files for coa2d.fits.
ASCII
0,1,2,3
A
< 1
inlst.txt
List of input files for coa2d.fits.
ASCII
0,1,2,3
A
< 1
out.pline
Output log.
ASCII
0,1,2,3
A
< 27
ridge.tbl
Extraction position table from bcd.fits or bksub.fits.
ASCII
0,2
A
< 57
tune.fits
Extracted spectrum from coa2d, in Jy. See tablenote (a).
32-bit real
0,1,2,3
A
25
tune.tbl
Extracted spectrum from coa2d, in Jy. See tablenote (a).
ASCII
0,1,2,3
P
< 134
xout.pline
Log files output from the extraction pipeline processing.
ASCII
0,1,2,3
A
< 15
(a) The data columns are: (1) spectral order, (2) wavelength in microns, (3) flux density in Janskys, (4) flux density uncertainty in Janskys, and (5) pixel status flag.
