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