I did a study on the pion rejection efficiency of the right arm gas cherenkov. The procedure was identical to earlier studies for the left arm (see log entries 329162 and 328898). Figure 1 shows the pion cut made using the shower and preshower. Figure 2 shows the event types using the pion cut. T3 was right s2m and T6 was right s2m and and right GC. I calculated the gas cherenkov's pion rejection inefficiency to be 0.15%. I used run #1818 with PS3=10 and PS6=1.