For externally described files, entries on input specifications are divided into the following categories:
*.. 1 ...+... 2 ...+... 3 ...+... 4 ...+... 5 ...+... 6 ...+... 7 ...+... 8 ...+... 9 ...+... 10
IRcdname+++....Ri..........................................................Comments++++++++++++
*.. 1 ...+... 2 ...+... 3 ...+... 4 ...+... 5 ...+... 6 ...+... 7 ...+... 8 ...+... 9 ...+... 10
I..............Ext-field+..................Field+++++++++L1M1..PlMnZr......Comments++++++++++++