What is CAL_PSF_MAG_SIG supposed to mean?

[Michael Wood-Vasey]

I've been assuming that CAL_PSF_MAG_SIG is supposed to be the uncertainty in the total measurement of PSF_MAG, i.e. the equivalent of PSF_INST_MAG_SIG (most likely should be the same as PSF_INST_MAG_SIG). But I finally looked at the code and I see that it's defined as the uncertainty in the _zeropoint_calibration_, not the uncertainty in the measurement.

psMetadataAdd (row, PS_LIST_TAIL, "CAL_PSF_MAG_SIG", PS_DATA_F32, "measured scatter of zero point calibration", zeroptErr);

I would bet that I am not alone in my confusion. If CAL_PSF_MAG_SIG is supposed to be the zeropoint calibration uncertainty, can we rename it to something else, e.g., CAL_PSF_ZPT_SIG, to be less confusing?

If it is supposed to just be the PSF_INST_MAG_SIG then it could easily just be set to that, but I appreciate that one would like to avoid redundancy in files.