This environment variable specifies the default record length, in bytes, for files which are opened without a RECL
tag in the OPEN
statement. This must be a positive integer. The default value is 1073741824 bytes (1 GB).
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https://gcc.gnu.org/onlinedocs/gcc-7.2.0/gfortran/GFORTRAN_005fDEFAULT_005fRECL.html