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     FORTRAN run-time error F6405
 
     external I/O illegal beyond end of file
 
     The program tried to access a file after executing an ENDFILE
     statement or after it encountered the end-of-file record during a
     read operation.
 
     A BACKSPACE, REWIND, or OPEN statement must be used to
     reposition the file before execution of any I/O statement that
     transfers data.
                                    -♦-