Shown in FIG 1 is {HEAD ~ an elongated array} 1 of {TAIL ~ a plurality} of individually controllable vapor sources 1a to 1f 
Shown in FIG 1 is { HEAD ~ an elongated array } 1 of { TAIL ~ a plurality } of individually controllable vapor sources 1a to 1f
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH