Table I: Number of accepted events, uncorrected number of identified particles and uncorrected for each magnetic field polarity. BPLUS BMINUS 26509 events 41850 events Number (MeV/c) Number (MeV/c) pi+ 6208 412 +/- 1 23223 254 +/- 1 pi- 14783 253 +/- 1 9679 410 +/- 1 K+ 136 358 +/- 4 256 248 +/- 4 K- 146 255 +/- 5 198 366 +/- 4 p 223 581 +/- 10 331 475 +/- 8 p-bar 109 481 +/- 12 218 560 +/- 8