/usr/share/metview/etc/VaporPrepareDef 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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{
	VAPOR_INPUT_MODE [interface = option_menu ]
    	{
                ICON  ; ICON 
                #PATH ; PATH
    	} = ICON 
	VAPOR_INPUT_DATA
         [ interface = icon, class = GRIB, exclusive = false,
           help = help_data,
           help_directory  = '/Metview/Defaults',
           help_name       = Data ]  
    	{ @ / }
    	VAPOR_INPUT_PATH [visible = false]
    	{
       		 @
    	}  = ''
	VAPOR_INPUT_NAME_PATTERN [visible = false]
	{
		@
	} = ''	
	
	VAPOR_2D_PARAMS 
	{
		@ 
		/
	} = 2t/10u/10v
	
	VAPOR_3D_PARAMS 
	{
		@ 
		/
	}	= t/u/v/r
	
	VAPOR_VERTICAL_GRID_TYPE  [interface = option_menu ]
	{
		REGULAR ; REGULAR
		LAYERED ; LAYERED
	} = LAYERED
	VAPOR_ELEVATION_PARAM
	{
		@
	} = 'z'
        VAPOR_BOTTOM_COORDINATE
	{
		*
	}= 0
	VAPOR_TOP_COORDINATE
	{
		*
	}= 16000
	VAPOR_AREA_SELECTION [interface = option_menu ]
        {
                NATIVE ; NATIVE 
                INTERPOLATE ; INTERPOLATE
	} = NATIVE	
		 	
	VAPOR_AREA 
        [
                help = help_input,
                help_icon = 'help_map',
                input_type = map,
                input_window = '/Metview/Defaults/Input Window'
        ]
  	{
                *
                /
        } = -90./-180./90./180
	
	VAPOR_GRID
	{
	  *
	  /
	} = 1/1
        VAPOR_STEP_NUMBER
	{
	  	*
	} = -1
	VAPOR_REFINEMENT_LEVEL [interface = option_menu ]
	{
		0 ; 0
                1 ; 1
		2;  2
		3 ; 3
                4 ; 4
	} = 2
	VAPOR_VDF_NAME
	{
	  @
	} = ''
	
	VAPOR_OUTPUT_PATH
	{
	  @
	} = '/tmp'
        VAPOR_REUSE_VDF [interface = option_menu, visible = false ]
	{
	       ON  ; ON 
               OFF ; OFF
	} = OFF
	
}	
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