*                                                               level_clip
Chapter 8 Display and Level Operations
*
level_clip
*
*   Clips the vector data in an import level so that no coordinate falls   
*   outside the 4 registered corners.  The map raster MUST be registered.
*   Only IMPORTED levels (35-95) may be clipped, NOT map vectors.  The 
*   clipping is always done to match the STRAIGHT-LINE (not geodetic) frame.
*
*   NOTE:  This command is normally used to clip TEMPLATE data so that only the 
*   portion of the template which overlays the map will be used for snapping.
*   If this is not done and the template crosses the map rectangle, then
*   level_snap MAY cause points on the map frame to move off of it.
*
*        level_clip level1 [level2]
*
*   Clears all data from levels level1 through level2, inclusive.
*   ___________________________________________________________________________
*   Options/arguments:
*
*        level1    Level number, beginning of range, where valid entries are
*                  35 - 95, inclusive
*        level2    [optional] Level number, end of range, where valid entries 
*                  are 0 - 95, inclusive
*
*   NOTE: If level1 is specified and level2 is not, then level2 = level1.
*   ___________________________________________________________________________
*   Example(s):
*
*   To clip the (import) data in level 35, enter:
*
*        level_clip 35
*   ___________________________________________________________________________
*   See also:
*
*             import, level_dup, level_clear 
*   ___________________________________________________________________________
