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h_graph()               Show graph of free pool.
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 Syntax:

 h_graph()

 Description:

 This function displays a graph of free memory pool; Prints a visual,
 character-based display of heap memory.  CHR(178) represents a used
 block and CHR(254) represents a free block.

 h_graph() shows the blocks allocated in Clipper's heap in the order that
 they exist.  The graph is not scaled!  There is a one-to-one
 correspondence between blocks on the graph and blocks on the heap. 
 There is no correspondence between the blocks on the graph and the size
 of the blocks in the heap.  To determine the block sizes, use h_rept().


----------------------------------[ Example ]------------------------------------

   DO fragmenter    && a suspected memory fragmenter
   CLEAR
   h_graph()