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Special commands and features are needed for indenting Fortran code in order to make sure various syntactic entities (line numbers, comment line indicators and continuation line flags) appear in the columns that are required for standard Fortran.
U.12.2.1 Fortran Indentation and Filling Commands Commands for indenting and filling Fortran. U.12.2.2 Continuation Lines How continuation lines indent. U.12.2.3 Line Numbers How line numbers auto-indent. U.12.2.4 Syntactic Conventions Conventions you must obey to avoid trouble. U.12.2.5 Variables for Fortran Indentation Variables controlling Fortran indent style.