RAOBCON -- Contours upper-air data from IRAB-schema point files
   RAOBCON param level map time day <keywords>
Parameters:
   param | parameter to contour; valid options are ELEV, P, Z, T, TD, DIR,
           SPD, STREAML (def=T); see table in Remarks for descriptions and
           default units
   level | level of the data; valid options are the mandatory levels: SFC,
           TRO1, TRO2, MAXW, 1000, 925, 850, 700, 500, 400, 300, 250, 200,
           150, 100 (def=500)
   map | map for the contour; use any predefined map in MAP command, e.g.,
         FL, MID, USA, WORL (def=do not draw map; use navigation of frame
         specified in NAV keyword)
   time | observation time (def=0 if current time is between 0 UTC and
          11:59 UTC; otherwise def=12)
   day | observation date; valid formats include YYYYDDD, YYYY/MM/DD and
         DD/MON/YYYY where YYYY, DDD, MM and DD are integers and MON is
         3 or more letters, e.g., JAN or JANUARY (def=current)
Keywords:
   CINt= | contour interval; specify 0 to let RAOBCON compute interval,
           a value greater than zero to select your own value, or name of
           a string that contains up to 64 values (def=value specified in
           CONTOUR.DEF text file if it has a entry matching the parameter,
           level and units; otherwise def=0)
   COLor= | graphics color level (def=2)
   DASh= | dash the contours: specify ALL for all contours, NEG for
           negative contours only or POS for positive contours only
   DATaset= | point dataset name and position; specify as alias.position
              or group/descriptor.position where position is a positive
              integer (absolute position), 0 or a negative integer
              (relative position), or ALL   (def=RTPTSRC/UPPERMAND.ALL)
   GRA= | graphic frame number to display output (def=current)
   LSIze= | contour label height, in pixels (def=8)
   NAV= | frame to use for navigation; specify frame number or C for
          current frame (def=C); you cannot use NAV keyword if anything
          other than the default value is used in the 'map' parameter
   UNIt= | units for specified parameter; see param table in Remarks for
           defaults; run CU LIST to list valid units and abbreviations
Remarks:
   RAOBCON builds and runs a PTCON command to display mandatory-level
   upper-air data from IRAB-schema point files.  RAOBCON accepts all the
   keywords in the PTCON command except LAT, LON, MAP, PRO, SLAT, SLON and
   PARAM because they may conflict with RAOBCON's parameters or keywords.
   You can use PTCON's SELECT keyword to limit the analysis to a specified
   list or range of values, but you cannot specify a different parameter,
   level, time, day or unit than those defined by RAOBCON's parameters and
   keywords.

   The table below lists the valid 'param' entries under "Param(s)", their
   default units under "DefUnits" and a description of the parameter under
   "Description".  Default units enclosed in parenthesis cannot be changed.

   Param    DefUnits   Description
   -------  ---------  ---------------------------------------------------
   ELEV        M       station elevation
   P           MB      pressure
   Z           M       height from surface
   T           C       temperature
   TD          C       dew point temperature
   DIR      (degrees)  wind direction
   SPD        KTS      wind speed
   STREAML             streamlines
---------
