{TAIL ~ The standard test pattern A} and the copy A are illuminated by {HEAD ~ 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 
{ TAIL ~ The standard test pattern A } and the copy A are illuminated by { HEAD ~ 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
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH