Specify the distance (mm) between the top edge of the printable area to the area where printing starts, within the range 0-100 mm in increments of 1 mm.
Note that there may be some discrepancy in the actual printing.

Printable area
Top Margin (topspace)
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If the "topspace" printing option is specified, the actual margin is calculated by adding this value and the value specified for "topspace".