A photoelectric conversion apparatus according to the present invention includes {HEAD ~ a plurality} of {TAIL ~ AD converters} 
of
A photoelectric conversion apparatus according to the present invention includes { HEAD ~ a plurality } of { TAIL ~ AD converters }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL