UV_TRACKS ALMA_ACA

        ---- Using UV_TRACKS for ALMA ----

    UV_TRACKS can be used to simulate ALMA observations,  using  the  /TABLE
    and  /FRAME options to create tables with one or several configurations.
    To do so, the command sequence must be

    OBSERVATORY alma
    SIC LOG astro_stations "alma-current.cfg"
    UV_TRACKS all [...options...]

    The logical astro_stations must point to a configuration file  of  ALMA.
    They  distributed  with  GILDAS and the currently offered configurations
    are named "alma-current-"'J'".cfg" and "aca-current.cfg" where J is  the
    configuration  number.   All the versions of previous ALMA configuration
    files are distributed under the  names  "alma-cycle"'I'"-"'J'".cfg"  and
    "aca-cycle"'I'".cfg",  where  I is the cycle number.  Note that when the
    configuration of several cycles are identical we keep only the files  of
    the  first cycle in which they were offered.  Then "uv_tracks all" means
    all stations will be used.

    For ACA, it is better to enter "observatory aca" - coordinates  are  the
    same, but this will make sure the proper antenna diameter is used in the
    computation of shadowing.