Keywords: mrtcal-user-manual

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## Display MJD values and tables

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.