************************                               Dan Kenny/Omaha, Ne.
* Format for GRF files *                                            
************************
----------------------------------------------------------------------------
Byte(s)  Len        Use                        Default Value  Valid Values
-------  ----  ------------------------------  -------------  ------------
  1       1    <unknown>                            13             --
  2       1    graph type                           --        01-06 (see below)
 3-4      2    <unknown>                         NULL (00)         --
  5       1    number of y-axis exprs            01 if PIE        01-05
  6       1    <unknown>                         NULL (00)         --
  7       1    color: y-axis expr 1 or slice 1   02 (green)   00-0F (see below)
  8       1    color: y-axis expr 2 or slice 2   03 (cyan)         ""
  9       1    color: y-axis expr 3 or slice 3   04 (red)          ""
 10       1    color: y-axis expr 4 or slice 4   05 (magenta)      ""
 11       1    color: y-axis expr 5 or slice 5   09 (lt blue)      ""
 12       1    color: slice 6                    0A (lt green)     ""
 13       1    color: slice 7                    0B (lt cyan)      ""
 14       1    color: slice 8                    0C (lt red)       ""
 15       1    color: slice 9                    0D (lt mag)       ""
 16       1    color: slice 10                   0E (yellow)       ""
17-26    10    <unknown>                         NULL (00)         --
 27       1    color: background                 01 (blue)         ""
 28       1    color: border & text              0F (white)        ""
29-78    50    <unknown>                         NULL (00)         --
---------------------------------------------------------------------------
The following descriptors are null-terminated character strings....
---------------------------------------------------------------------------
79-159   81    page title                       
160-240  81    footnote                                             
241-321  81    x-axis title              -   not used with PIE             
322-402  81    y-axis title              -   not used with PIE
403-463  61    x-axis expression         -   under PIE, SLICES
464-524  61    y-axis expression 1       -   under PIE, SIZE  
525-585  61    y-axis expression 2       -   under PIE, EXPLODE
586-646  61    y-axis expression 3       -   not used with PIE
647-707  61    y-axis expression 4       -   not used with PIE
708-768  61    y-axis expression 5       -   not used with PIE

---------------------------------------------------------------------------
Files size for GRF's are a constant 768 bytes.  
---------------------------------------------------------------------------
    Chart Types                                   Colors
--------------------                  -----------------------------------
01 ... Bar Graph                      00 ... Black     08 ... Dark Grey
02 ... Pie Chart                      01 ... Blue      09 ... Lt Blue
03 ... Line Graph                     02 ... Green     0A ... Lt Green
04 ... Scatter Plot                   03 ... Cyan      0B ... Lt Cyan
05 ... Step Graph                     04 ... Red       0C ... Lt Red
06 ... Regress Line                   06 ... Magen     0D ... Lt Magenta
                                      06 ... Brown     0E ... Yellow
                                      07 ... Grey      0F ... White
