groff: Indentation values in ms
4.3.5.5 Indentation values
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In many situations, you may need to indentation a section of text while
still wrapping and filling. Lists in ms, for an example of
nested lists.
-- Macro: .RS
-- Macro: .RE
These macros begin and end an indented section. The 'PI' register
controls the amount of indentation, allowing the indented text to
line up under hanging and indented paragraphs.
ms Displays and Keeps, for macros to indentation and turn off
filling.