Seiko Instruments SII Black-and-White Raster Plotter LP-1020 - Manual (Page 134)

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■SIZE MARGIN (mm) / SIZE MARGIN (in)
Allows for setting of the margin to be used or extended fixed form paper
is used when these settings also apply a plot is produced on paper size in
the actual length. The paper size of the fixed size or paper roll size is
judged as being larger by the value preset for the size margin. However,
the area where plotting can be performed actually is the original paper
size, and thus the drawing area beyond the original paper size is clipped.
<Parameter (numerical value input method)>
0 to 30 (0 to 1.1 inches) Default value = 2 (0.08 inches)