The .vmi command specifies the amount of vertical space each line uses. The .vmi spacing is allocated in 2.08-inch increments, and is essentially the flip side of the .lpi command. For example, if the .lpi is set to 6, the equivalent .vmi setting is 8.
.vmi number.lines
| number.lines | Specifies the number of lines per inch. The default is 8. |
Sets the .vmi to approximately four lines per inch. This specifies an actual line spacing of .25-inch per line.
.vmi 12