The timing diagram hypothetically shows {HEAD ~ a spectrum} divided equally among 13 channels on the horizontal axis and {TAIL ~ 97 time slots} on the vertical axis 
divided equally among
The timing diagram hypothetically shows { HEAD ~ a spectrum } divided equally among 13 channels on the horizontal axis and { TAIL ~ 97 time slots } on the vertical axis
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH