Sun Studio 12 Update 1: Fortran User's Guide
4.8.1.1 Fixed-Form Source
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Put CDIR$ or !DIR$ in
columns 1 through 5.
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Directives are listed in columns 7 and beyond.
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Columns beyond 72 are ignored.
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An initial directive line has a blank
in column 6.
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A continuation directive line has a nonblank
in column 6.
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