Old CGI ETC Limitations and Known Problems
- Calculations are done only for the brightest pixel.
- The saturation limits have not been updated. The CGI-ETC uses the old Cycle 7 values (145,000 e-, 145,000 e-, and 185,000 e-
for NIC1, NIC2 and NIC3 respectively, instead of 116,000 e-, 111,000 e-, and 178,000 e- for Cycles 11+).
- Although the CGI-ETC results agree with those of the APT-ETC for the large majority of cases, there are a few exceptions for which the CGI-ETC gives wrong answers. Known
cases are:
- NIC2 + F212N
- NIC2 + F215N
- NIC2 + F216N
- NIC3 + F212N
when the HST standard spectrum of G191B2B is selected.
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