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