Alternatively, or in addition, {HEAD ~ the storage medium} may be provided with repeaters or {TAIL ~ other amplifying means} which compensate for any propagation losses 
Alternatively , or in addition , { HEAD ~ the storage medium } may be provided with repeaters or { TAIL ~ other amplifying means } which compensate for any propagation losses
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH