The standard test pattern A and {HEAD ~ the copy A} are illuminated by {TAIL ~ two light sources} 7 and 7 in succession so that a complete TV picture frame is obtained first from the pattern A and then the copy A 
are illuminated by
The standard test pattern A and { HEAD ~ the copy A } are illuminated by { TAIL ~ two light sources } 7 and 7 in succession so that a complete TV picture frame is obtained first from the pattern A and then the copy A
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH