CLAS physics database search results Measurement E151M363 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.55 246 -0.3918 0.8652 0.0382 0.65 246 1.9868 1.3276 0.1233 0.65 258 3.7185 3.7185 0.2259 0.75 114 -1.6243 0.6046 0.1023 0.75 234 -0.28 0.8632 0.0344 0.75 258 -0.4462 0.7388 0.0403 0.85 246 0.4651 0.9764 0.041 0.85 258 -0.1297 0.8294 0.031 0.85 270 0.8093 1.1367 0.0572 0.95 258 -0.5235 0.6833 0.0435 0.55 258 -0.9555 0.6688 0.0663 0.65 126 0.2457 0.7419 0.0336 0.65 258 -0.58 0.6992 0.0468 0.75 258 -1.0544 0.6568 0.0719 0.85 126 -0.5386 0.6698 0.0449 0.85 138 -0.1765 0.7003 0.0319 0.85 246 -0.0216 0.6227 0.03 0.85 258 0.2914 0.5551 0.035 0.95 258 -0.1805 0.6079 0.032