The VPOS= graphics option
overrides the values of the LROWS or PROWS device parameters and temporarily
sets the number of columns in the graphics output area. VPOS= does
not affect the height of the graphics output area but merely divides
it into rows. Therefore, you can use VPOS= to control cell height.
The values specified
in the HPOS= and VPOS= graphics options determine the size of a character
cell for the graphics output area and consequently the size of many
graphics elements, such as hardware text. The larger the size of
the HPOS= and VPOS= values, the smaller the size of each character
cell.