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       COMMAND

       llllggggrrrraaaannnnggggeeee,,,, llllttttrrrraaaannnnggggeeee ---- sssseeeetttt rrrraaaannnnggggeeee wwwwiiiinnnnddddoooowwww lllliiiimmmmiiiittttssss

       USAGE

       llllggggrrrraaaannnnggggeeee _m_i_n_i_m_u_m _m_a_x_i_m_u_m

       llllttttrrrraaaannnnggggeeee _m_i_n_i_m_u_m _m_a_x_i_m_u_m

       DESCRIPTION

       These commands allow a window to be defined within which
       most other commands will operate.  Most commands will not
       affect points outside of the window.  These commands do not
       change any data values.  The window may be expanded later
       and the data points that were outside of the window will
       re-appear.  The window parameters are stored in the image
       header and will persist over save and fetch operations.

       The values _m_i_n_i_m_u_m and _m_a_x_i_m_u_m are the latitudes and
       longitudes which define the window.  LLLLggggrrrraaaannnnggggeeee sets the
       longitude limits.  LLLLttttrrrraaaannnnggggeeee sets the latitude limits.  The
       limits are inclusive.  The latitudes and longitudes given
       will be included in the window.

       Remember that the numbering of latitudes and longitudes
       begins with zero.  The present settings are available with
       ssssttttaaaattttuuuussss.

       Some commands ignore the window and operate on the entire
       image:

       ddddlllloooonnnngggg       Always displays all values.

       cccclllleeeeaaaarrrr       Clears the entire image.

       ffffeeeettttcccchhhh       Always fetches the entire image.

       ffffllllaaaaggggsssseeeetttt     Flags affect the entire image.

       llllggggiiiinnnnccccrrrr      Affects all longitude increments, there can be
                   only one increment.

       llllttttiiiinnnnccccrrrr      Affects all latitude increments, there can be
                   only one increment.

       ssssaaaavvvveeee        Saves the entire image, preserves the window
                   values.










