made by the High Resolution Fly's Eye (HiRes) and Pierre Auger Observatory (PAO) are
seemingly contradictory, but utilize different detection methods, as HiRes was a stereo
detector and PAO is a hybrid detector. The five year Telescope Array (TA) Middle Drum
hybrid composition measurement is similar in some, but not all, respects in methodology to
PAO, and good agreement is evident between data and a light, largely protonic, composition …