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  distrib-
    uted  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 computa-
    tion of shadowing.