-They've used Fortran 77 which requires 6 whitespaces before a normal statement, 5 + any character for line continuations, and which truncates silently (as in,

-They've used Fortran 77 which requires 6 whitespaces before a normal statement, 5 + any character for line continuations, and which truncates silently (as in, without warning) any line longer than 72 characters.