The Y Size box contains the printer command which sets the rectangle
height.
Diconix 150 Plus
For the Diconix 150 Plus printer, the Y Size box is empty.
HP LaserJet IIP
For the HP LaserJet IIP printer, the Vertical Rectangle Size command
(ESC*cnB) specifies the rectangle's height in 1/300 inch units. The
argument n specifies the number of units.
To specify the Vertical Rectangle Size command, type the following in the Y
Size box:
\x1B*c%dB