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AUCTeX will indent new lines to indicate their syntactical relationship to the surrounding text. For example, the text of a `\footnote` or text inside of an environment will be indented relative to the text around it. If the indenting has gotten wrong after adding or deleting some characters, use <TAB> to reindent the line, M-q for the whole paragraph, or M-x LaTeX-fill-buffer <RET> for the whole buffer.