Next: MODIFY CABLE
Up: MODIFY
Previous: MODIFY BASELINE
Contents
Index
MODIFY BUG
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.
Gildas manager
2024-03-29