, with the contents of four lines changed to

v1= -1.0  ; Low  value for isopleths, disregarded when  nv  is 0 or 1
v2=  7.5  ; High value for isopleths, disregarded when  nv  is 0 or 1
nv= 17    ; No. of isopleths, there will be  nv+1  colors

in order to specify the use of contours and colors.

Dcontour.sh: syntax

Dcontour.sh --help

       Dcontour.sh  /  ncl-metno 1.2

>>>
>>>
>>> Syntax:
>>> =======
>>>
>>> -> for 2D fields:
>>>  Dcontour.sh <option> <file1> <file2> <var1> <var2>
>>> -> for 3D fields:
>>>  Dcontour.sh <option> <file1> <file2> <var1> <var2> [<d3node1> <d3node2>]
>>> -> for 4D fields:
>>>  Dcontour.sh <option> <file1> <file2> <var1> <var2> [<d3node1> <d3node2> (<d4node1> <d4node2>)]
>>>
>>> where
>>>    <option>    specifies dimensions and geo- or nongeo-grid
>>>                 implemented:
>>>                  [234]d    - [234]D fields
>>>                  [234]dmap - [234]D fields, dims. are lon & lat
>>>                  [234]dMap - [234]D fields, lon & lat are 2d fields
>>>                  ...[234]d[mM]ap will be displayed on a geogr. map
>>>    <file1>     name of netcdf file w/<var1>
>>>    <file2>     name of netcdf file w/<var2>,
>>>                 you may type '.' if <file1> & <file2> are the same
>>>    <var1>      name of requested variable on <file1> (case sensitive)
>>>    <var2>      name of requested variable on <file2> (case sensitive)
>>>                 you may type '.' if <var1> & <var2> are the same
>>>    <d3node1>, <d3node2>
>>>                node no.s of third dimension for <var1> and <var2>,
                    respectively
>>>                you may type '.' for <d3node2> if <d3node1>
>>>                 and <d3node2> are the same
>>>                if <option> is one of 2d, 2dmap and a fourth
>>>                  argument is present, or if <d3node1> is negative,
>>>                  this will be interpreted as a flag that will cause
>>>                  the ncl script to remain (see examples below)
>>>    <d4node1>, <d4node2>
>>>                node no.s of fourth dimension for <var1> and <var2>,
                    respectively
>>>                you may type '.' for <d4node2> if <d4node1>
>>>                 and <d4node2> are the same
>>>
>>>  Special case:
>>>   If <option> is one of [234]dMap, the name of the 2d longitude and
>>>    latitude variable may be specified on the command line, e.g. for 3D fields:
>>>   Dcontour.sh <option> <lonname> <latname> <file1> <file2> <var1> <var2> [<d3node1> <d3node2>]
>>>    (Alternatively, if these names are not 'lon' or 'lat', 'userdef.ncl' may
>>>     be edited when option is one of [234]dMap.)
>>>
>>>  The script will produce an eps-file and a png-file.
>>>
>>>
>>> User specifications:
>>> ====================
>>>
>>>  By copying the default spec.s from