The INM Inter Arrival Time Step for the IAT anomaly generation.
The valid values for INMIATS range from 0 from 7 in steps. The range of
values of inter-arrival times recorded in a single bin is 2^(INMIATS).
All inter-arrival times greater than or equal to INMIATO+6*(2^INMIATS)
are recorded in the 7th bin of INMAIAT.