Depending on the energy absorption requirements of the specific application, the depth of {HEAD ~ the channel} may be up to the depth of {TAIL ~ the recess} 
Depending on the energy absorption requirements of the specific application , the depth of { HEAD ~ the channel } may be up to the depth of { TAIL ~ the recess }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL