adjusting each program clock reference time stamp of each scheduled program clock reference bearing transport packet based on {HEAD ~ a drift} between said local clock and {TAIL ~ a program system time clock} from which said program clock reference time stamp was generated, if any, and 
between
adjusting each program clock reference time stamp of each scheduled program clock reference bearing transport packet based on { HEAD ~ a drift } between said local clock and { TAIL ~ a program system time clock } from which said program clock reference time stamp was generated , if any , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH