{TAIL ~ Control signal} 47 may be supplied by {HEAD ~ control path} 18, a schematic diagram of which is shown in FIG 4 in accordance with an embodiment of the present invention 
{ TAIL ~ Control signal } 47 may be supplied by { HEAD ~ control path } 18 , a schematic diagram of which is shown in FIG 4 in accordance with an embodiment of the present invention
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH