In FIG 1, the sensor 23 is indicated by broken lines near the margin 21 of the strip 20 in {TAIL ~ the region} of {HEAD ~ the cross cutting} means 
In FIG 1 , the sensor 23 is indicated by broken lines near the margin 21 of the strip 20 in { TAIL ~ the region } of { HEAD ~ the cross cutting } means
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH