emlfill fills in missing entries in the emllist.fits file. Whenever the summary row (ID_BAND=0) is NULL, it prevents those sources from being excluded in the ESAS pipeline. This sets the value of the summary row to the average of the remaining instruments' fluxes for source exclusion purposes. For example:
ML_ID_SRC ID_BAND FLUX FLUX_ERR
cgs cgs
1 1 0 2.5142931E-14 1.4215882E-15
2 1 1 2.7656696E-14 2.0757946E-15
3 1 1 2.0042268E-14 2.5936310E-15
4 1 1 2.6675544E-14 2.9605379E-15
5 2 0 1.9649774E-14 1.2162156E-15
6 2 1 2.5054459E-14 1.9247998E-15
7 2 1 1.5255677E-14 2.0912418E-15
8 2 1 1.7091336E-14 2.3737423E-15
9 3 0 INDEF 0.0000000E+00
10 3 1 INDEF INDEF
11 3 1 1.0045201E-14 1.1888119E-15
12 3 1 5.8909498E-15 9.5059892E-16
emlfill sets row 9 FLUX to be the average of rows 11 and 12, and the row 9 FLUX_ERR to be the sqrt of the sum of the squares of values in it's rows 11 and 12.
Warning and requirements: emlfill was part of the package esas until SAS-20 but is now a standalone task. It works within the esas pipeline data reduction scheme.