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Source lines longer than the applicable length are truncated to that length. Currently, g77 does not warn if the truncated characters are not spaces, to accommodate existing code written for systems that treated truncated text as commentary (especially in columns 73 through 80).
See Options Controlling Fortran Dialect, for information on the -ffixed-line-length-n option, which can be used to set the line length applicable to fixed-form source files.