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5.1.1 Filling and Adjusting

When gtroff reads text, it collects words from the input and fits as many of them together on one output line as it can. This is known as filling.

Once gtroff has a filled line, it tries to adjust it. This means it widens the spacing between words until the text reaches the right margin (in the default adjustment mode). Extra spaces between words are preserved, but spaces at the end of lines are ignored. Spaces at the front of a line cause a break (breaks are explained in Implicit Line Breaks).

See Manipulating Filling and Adjusting.