Keywords: mrtcal-user-manual

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## A simple session (at Pico Veleta)

If you want to recalibrate the IMB-FITS files in your project account at Pico Veleta (i.e. located in `/observationData/imbfits/`), you must consider that you have no write access to this directory. In this case, you can not put the `index.mrt` file together with the IMB-FITS files. The solution is to create it elsewhere (it will be your responsibility to remember the association between the index file and the directory where the IMB-FITS files can be found):

    ! Go to working local directory (with all permissions):
    MRTCAL> sic directory some/working/dir/

    ! Build the index (named myindex.mrt in current working directory)
    ! for IMB-FITS files found in ~/observationData/imbfits/
    MRTCAL> index build ~/observationData/imbfits/ /file myindex.mrt

Then the subsequent commands are identical to the previous section. If you need to update or reopen the index file without rebuilding it from scratch, the corresponding commands are respectively:

    MRTCAL> index update  ~/observationData/imbfits/ /file myindex.mrt

    MRTCAL> index open  ~/observationData/imbfits/ /file myindex.mrt