Do not use columns 73-80 in source file
If you encounter problems with unmatched parentheses or quotation marks
or illegal continuation characters, the problem may be that you are not
adhering to the Fortran conventions for column format. You need to be
careful about which columns contain which characters. If you violate
the rules for column format you can get obscure errors. Here is a
summary of the format:
Column Contents
--------------- ---------------------------------------------
1 'C' (indicating a Comment) or the first digit
of a statement number.
2 to 5 Remaining digits of a statement number.
6 Non-blank character indicates a continuation
of the previous line.
7 to 72 Program statements.
73 to 80 Must be blank!
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