/usr/share/metview/etc/ThermoViewDef is in metview-data 4.8.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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{
   TYPE
   {
      TEPHIGRAM
      SKEW_T
      EMAGRAM
      STUVE
   } = TEPHIGRAM
   BOTTOM_PRESSURE
   {
       *
   } = 1015.0
   TOP_PRESSURE
   {
       *
   } = 100
   MINIMUM_TEMPERATURE
   {
       *
   } = -90
   MAXIMUM_TEMPERATURE
   {
       *
   } = 50
   THERMO_GRID [
         interface       = icon,
         class           = MTHERMOGRID,
         missing         = ignored,
         help            = help_data,
         help_name       = Thermo Grid,
         help_directory  = '/System/Defaults',
         help_class      = MTHERMOGRID,
         help_definition = ( MTHERMOGRID )
        ]
   { @ }
   POINT_SELECTION
   {
      COORDINATES
      AREA_AVERAGE
      STATION
   } = COORDINATES
   COORDINATES
      [
         help         = help_input,
         help_icon    = 'help_point',
         input_type   = point,
         input_window = '/System/Defaults/Input Window'
      ]
   {
      *
      /
   } = 0./0.
   AREA_AVERAGE
      [
         help         = help_input,
         help_icon    = 'help_area',
         input_type   = area,
         input_window = '/System/Defaults/Input Window'
      ]
   {
      *
      /
   } = 30./-30./-30./30.
   STATION
      [ interface       = icon,
        class           = STATION,
        exclusive       = false,
        help            = help_data,
        missing         = fatal,
        help_directory  = '/System/Defaults',
        help_name       = Station for Thermo,
        help_class      = STATIONS,
        help_definition = ( STATIONS, NAME = Heathrow )
      ]
   { @ / }
   POINT_EXTRACTION
   {
      INTERPOLATE
      NEAREST_GRIDPOINT
   } = INTERPOLATE
   DEW_POINT_FORMULATION
   {
      SATURATION_OVER_WATER
      MIXED_PHASE_0_TO_-23
   } = SATURATION_OVER_WATER
   TEMPERATURE_PARAM
   { * } = 130
   SPECIFIC_HUMIDITY_PARAM
   { * } = 133
   LNSP_PARAM
   { * } = 152
   U_WIND_PARAM
   { * } = 131
   V_WIND_PARAM
   { * } = 132
   MAP_OVERLAY_CONTROL
   {
      ALWAYS
      BY_DATE
      BY_LEVEL
      NEVER
   }= ALWAYS_OVERLAY
   SUBPAGE_X_POSITION
   {
      @
   } = 12
   SUBPAGE_Y_POSITION
   {
      @
   } = 10
   SUBPAGE_X_LENGTH
   {
      @
   } = 75
   SUBPAGE_Y_LENGTH
   {
      @
   } = 80
%include PageFrameDef
%include SubpageFrameDef
}
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