`gtroff' uses two dimensions with each line of text, type size and
vertical spacing. The "type size" is approximately the height of the
tallest glyph.(1) (Note: Sizes-Footnote-1) "Vertical spacing" is the
amount of space `gtroff' allows for a line of text; normally, this is
about 20% larger than the current type size. Ratios smaller than this
can result in hard-to-read text; larger than this, it spreads the text
out more vertically (useful for term papers). By default, `gtroff'
uses 10 point type on 12 point spacing.
The difference between type size and vertical spacing is known, by
typesetters, as "leading" (this is pronounced `ledding').
- Changing Type Sizes
- Fractional Type Sizes
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