This is compared to {TAIL ~ the time step} that is inherent in a user desired {HEAD ~ frequency schedule} 
This is compared to { TAIL ~ the time step } that is inherent in a user desired { HEAD ~ frequency schedule }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD