/sys$common/syshlp/DTSDTR.HLB  —  INTERRUPT  COMMAND-SPECIFIC QUALIFIERS, /SIZE
       /SIZE=number

    Indicates the data message length in bytes. The lower bounds are 0 for
    a sink or echo test; 4 for a sequence test; and 5 for a pattern test.
    The upper bound is 16 bytes for all tests. The default size is 16.
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