Vertical plot size- Page 14

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User units

Coordinate units specified by the user with the HP-GL and HP-GL/2 SC command. 

Vector graphics

A method of defining graphic images in terms of coordinates,  points and lines.  The 
HP-GL and HP-GL/2 graphics languages use this method. 

Vertical plot size

The original vertical size of an imported HP-GL and HP-GL/2 image. 

VMI

Vertical motion index.  The vertical distance that the print position moves down the 
page when a line feed is performed.  This can be set using printer commands or 
with the printer's control panel by adjusting the "Lines" menu option in PAGE 
FORMAT MODE.