HORIZON

        [ASTRO\]HORIZON h1 h2 ... [/SOURCE ... ] [/PLANET ...  ]  [/AIRMASS]
    [/FLUX Fmin Fmax] [/PROJECT]

    This command is used to produce plots of LST ranges of visibility, above
    specified  elevations,  of  sources and planets. A line is drawn for all
    hours when the object is visible above  elevation  h1;  tick  marks  and
    labels  are  provided  for  elevations  h1,  h2,  ...  (in  degrees), or
    corresponding air masses values (with /AIRMASS option). Elevation values
    must  be in increasing order, or airmasses in decreasing order. UTC axis
    is drawn on  top  of  the  plot.  A  label  with  date  and  observatory
    coordinates is plotted.
        /SOURCE                  will plot on one page all sources
                                 of the Current (by default) or Alternate
                                 (optionally) catalog.
        /SOURCE name1 name2 ...  will be restricted to the specified sources
        /SOURCE NEXT n           will plot the next n sources in the current
                                 catalog; (repeat this command to avoid over-
                                 crowded pages)
        /PLANET                  will plot on one page all solar-system bodies
        /PLANET name1 name2 ...  will be restricted to the specified bodies
        /ALTERNATE               with /SOURCE, will use the Alternate catalog.
        /FLUX Fmin Fmax          restrict the search to sources with flux in
                                 the specified range.
        /PROJECT                 add the project name (for Plateau de Bure
                                 bookkeeping