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