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The headers and tables found in the IMB-FITS file rely heavily on
time-stamps described with Modified Julian Date (MJD). This includes
subscan start and stop, instantaneous antenna positions during the
subscan, dump sampling during integration. These quantities can be
displayed in a graphical way with e.g. the following command:
MRTCAL> @ plot-mjd iram30m-4mhz-20100930s200-imb.fits
The result is shown in the Figure
.
Figure:
Resulting plot of the procedure @ plot-mjd, showing
the subscans start and stop (black boxes), the time stamps of the
AntSlow dumps in each subscan (blue crosses), and the time stamps
of the derotator dumps if relevant (magenta crosses). Each DATA
dump is displayed as an horizontal segment showing its actual
integration time. The associated time stamp is displayed as a
vertical segment (the time stamp can be found anywhere from the
beginning to the end of the integration, according to the header
value TSTAMPED). Colors are alternated to avoid confusion.
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Gildas manager
2023-06-01