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