The Gray Fill box contains the printer command or commands which fill a rectangle with a shade of gray.
For the Diconix 150 Plus printer, the Gray Fill box is empty.
For the HP LaserJet IIP printer, the Area Fill ID and the Fill Rectangular Area commands are combined into a single command. The Area Fill ID command (ESC*cnG) specifies the shade of gray, and the Fill Rectangular Area command (ESC*cnP) fills a rectangular area.
For the Area Fill ID command, n specifies the percent of shading. For the Fill Rectangular Area command, n specifies the type of fill. The following lists the type of fill and its value.
| Value | Fill |
| 0 | Black |
| 1 | White |
| 2 | Shading |
| 3 | Cross-hatch |
| 5 | Current pattern |
To specify the combination, type the following in the Gray Fill box:
\x1B*c%dG2P