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BUFF_LIMIT()
   Limits access to a portion of the buffer.

   Syntax
         BUFF_LIMIT([nStartRow,nEndRow])

   Arguments
         OPTIONAL PARAMETERS
         nStartRow   Sets the starting buffer row.
         nEndRow     Sets the ending buffer row.

   Returns
         BUFF_LIMIT([@nStartRow,@nEndRow])

   Description
         BUFF_LIMIT() limits access by PLOT() and other functions to a
         portion of the buffer. The nStartRow and nEndRow parameters define
         the accessable rows within the buffer. The first row is row 1 and
         the last row is RET_COUNT() in the data buffer . If no parameters
         are entered, then the nStartRow is reset to row 1 and nEndRow is
         set to RET_COUNT().