A clamping arrangement keeps {HEAD ~ the foam sheet material} in linear alignment at {TAIL ~ the location} where the sample is severed 
A clamping arrangement keeps { HEAD ~ the foam sheet material } in linear alignment at { TAIL ~ the location } where the sample is severed
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH