An apparatus is also provided for calibrating {HEAD ~ a sensor} which may be used for measuring {TAIL ~ color} of a display in one or more of these methods 
An apparatus is also provided for calibrating { HEAD ~ a sensor } which may be used for measuring { TAIL ~ color } of a display in one or more of these methods
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH