CLAS physics database search results Measurement E151M1186 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.75 102 1.4707 1.0506 0.1116 0.75 114 -0.1026 0.9176 0.0309 0.75 198 0.5644 0.9743 0.051 0.75 210 0.0857 0.8249 0.0306 0.75 222 0.7777 0.9397 0.0643 0.75 270 0.2406 0.8658 0.0348 0.75 282 -0.0242 0.8707 0.0301 0.85 90 -0.1008 0.8514 0.0309 0.85 102 -1.1131 0.5915 0.0867 0.85 114 1.014 0.8161 0.08 0.85 126 0.1919 0.9566 0.0331 0.85 186 -0.1262 0.7622 0.0314 0.85 198 0.0968 0.778 0.0308 0.85 210 -0.2332 0.7405 0.0345 0.85 222 0.4451 0.8341 0.0443 0.85 270 1.7864 1.0138 0.134 0.95 210 1.141 0.9961 0.0886