Separate embodiments allow testing either in vacuum or in air, with or without insulating {HEAD ~ passivation layers} present on {TAIL ~ the chip} 
present on
Separate embodiments allow testing either in vacuum or in air , with or without insulating { HEAD ~ passivation layers } present on { TAIL ~ the chip }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL