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Technical Details
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Horizontal and vertical spacing and resolution
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WoMan currently assumes 10 characters per inch horizontally, hence a
horizontal resolution of 24 basic units, and 5 lines per inch
vertically, hence a vertical resolution of 48 basic units.  (`NROFF'
uses 240 per inch.)

Vertical spacing and blank lines
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The number of consecutive blank lines in the formatted buffer should be
either 0 or 1.  A blank line should leave a space like .sp 1.  Current
policy is to output vertical space only immediately before text is
output.