| Offsets | Name | Length | Format | Description | |
|---|---|---|---|---|---|
| 0 | SMF99_IO_PLOT_BW | 4 | binary | Bucket width. | |
| 4 | 4 | SMF99_IO_PLOT_LSTX | 4 | binary | Last plotted x bucket. |
| 8 | 8 | Reserved. | 4 | binary | Reserved. |
| 12 | C | SMF99_IO_PLOT _POINTS_OF | 4 | binary | Offset of the point entries. |
| 16 | 10 | SMF99_IO_PLOT _POINTS_ON | 2 | binary | Number of point entries. |
| 18 | 12 | SMF99_IO_PLOT _POINTS_LN | 2 | binary | Length of a point entry. |