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