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CLIC\MODIFY BUG number
This command is reserved for the correction of nasty bugs in the data
acquisition. The number is used for identification.
Current accepted values:
1 Affecting data taken between 11-nov-1995 and 09-jan-1996. Bug in
RDI found by S.Guilloteau. The continuum data was erroneously cali-
brated in the real-time aquisition. As result, the continuum data
did not agree with the average of the spectral data. For instance
plotting data with "set sub C02 L02" as a function of time gives
different results for C02 and L02. The result would affect line in-
tensities if, as is usually the case, the amplitude calibration is
done with the continuum subbands.
Correction: the current index should contain both atmosphere cali-
brations and correlation data; the data file should be open for both
input and output. This command should not affect data taken before
11-nov-1995 and after 09-jan-1996; be careful for the last day since
the hour is not checked, and RDI was corrected at 3pm.
2 Affecting data taken between 26-jan-2015 and 05-mar-2015. Bug in
correl after change of commons to 7 antennas. Consequence is a phase
offset between narrow band correlator units and widex units depend-
ing on elevation and baseline.
MODIFY BUG 2 will correct the bug. Warning: this correction is an
offset to the phases, so it should be applied only once. If the cor-
rection is done on data file (IPB), there is a check that this is
the case, but header files (HPB) are not protected against correct-
ing twice.
3 Affects data reduced with a CLIC version compiled from 15-jun-2023
to 19-oct-2023, if HR spw are present and any MODIFY (ANTENNA, BASE,
DELAY ...) was done in lowres mode. In that case, CLIC stored data
modifiers only for the low-resolution spectral windows.
MODIFY BUG 3 will check the data modifier from both LR and HR, and
if they do not match will apply the complement of LR to HR.