/usr/share/metview/etc/MXSectionViewDef 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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{
   BOTTOM_LEVEL
   {
      *
   } = 1100.0
   TOP_LEVEL
   {
      *
   } = 0.01
   %include MXSectionCommonDef
#   MAP_PROJECTION  [ visible = false ]
#   {
#      cartesian
#   } = cartesian
   HORIZONTAL_AXIS [interface       = icon,
                    class           = MAXIS,
                    missing         = ignored,
                    help            = help_data,
                    help_name       = Horizontal Axis,
                    help_directory  = '/System/Defaults',
                    help_class      = MAXIS,
                    help_definition = ( MAXIS, AXIS_ORIENTATION ='HORIZONTAL' )
                   ]
   {
      @
   }
   VERTICAL_AXIS [interface = icon,
                  class           = MAXIS,
                  exclusive       = true,
                  missing         = ignored,
                  help            = help_data,
                  help_name       = Pressure Axis,
                  help_directory  = '/System/Defaults',
                  help_class      = MAXIS,
                  help_definition = ( MAXIS, AXIS_ORIENTATION ='VERTICAL', AXIS_TITLE_TEXT = 'Pressure (hPa)' )
                 ]
   {
      @
   }
   SUBPAGE_CLIPPING
   {
      ON
      OFF
   } = OFF
   SUBPAGE_X_POSITION
   {
      @
   } = 7.5
   SUBPAGE_Y_POSITION
   {
      @
   } = 7
   SUBPAGE_X_LENGTH
   {
      @
   } = 85
   SUBPAGE_Y_LENGTH
   {
      @
   } = 80
   %include PageFrameDef
   %include SubpageFrameDef
}
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