The text of a Fortran statement is placed in the statement field. Because the compiler ignores the tab character and spaces (except in character constants and Hollerith constants ), you can space the text in any way desired for maximum legibility.
By default, the statement field extends to character position 72. If
the default is in effect, any text following position 72 is ignored
and no warning message is printed.
You can extend the statement field to position 132 if you specify
the compiler option EXTEND_SOURCE or if you specify OPTIONS/EXTEND_
SOURCE.