UV_TRACKS

        [CLEAN\]UV_TRACKS   Declination   [Frequency   [Astro_Station]]  [/FRAME
    [size]]  [/HORIZON Elmin] [/HOUR_ANGLE Hmin [Hmax]] [/INTEGRATION t]  [/STA-
    TIONS  ALL|list]  [/TABLE  [Name]] [/WEIGHT Mode] [/SIZE [Size1] [NantSize1]
    [Size2] [NantSize2] ...]  [/OFFSET offset]

    Plot interferometer UV coverage as observed with  the  interferometer.   The
    default  is  for NOEMA, but the command is more general and can be used with
    any array, especially ALMA or SMA.

    Station coordinates are searched for in the file defined by  the  ASTRO_STA-
    TIONS  logical  variable. Stations should be referred to by a mnemonic (e.g.
    E003, W000 ...) given as arguments of UV_TRACKS.  Note that  with  the  con-
    truction  of  the  NOEMA  track  extension  the  mnemonic names changed from
    [E,N,W]+2digits for the station number to [E,N,W]+3digits  for  the  station
    number.  Old names are still accepted during a transition period.

    The size of the antennas can be specified with the /SIZE option.

    The  /STATIONS  option  allows  to use the ranks of the stations in the file
    rather than the mnemonic names.

    Some configuration files for NOEMA,  ALMA,  and  SMA  are  distributed  with
    gildas  and  can be used as ASTRO_STATIONS files combined with UV_TRACKS ALL
    to avoid typing a lot of station names (see HELP UV_TRACKS NOEMA|ALMA|SMA)

    The coordinates of the most recently selected SOURCE or PLANET  are  consid-
    ered.  The  frequency of the simulated observation is read from the Sic FRE-
    QUENCY variable (which is also set by LET FREQUENCY command).

    UV_TRACKS can be used iteratively, to simulate the observations  of  several
    configurations.  Option  /FRAME indicate the start of a new observations: if
    not present, configurations are being stacked on the  current  UV  coverage.
    The  user  may  select another color pen to distringuish between the various
    coverages. A sketch of the interferometer  described  by  ASTRO_STATIONS  is
    also drawn, and the selected stations/antennas are highlighted.