CLAS physics database search results Measurement E151M6 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.55 246 0.7019 0.5082 0.0853 0.55 258 -0.6589 0.4173 0.0807 0.55 270 0.2915 0.365 0.0447 0.55 282 -0.285 0.3924 0.0442 0.65 246 -0.4752 0.3415 0.0618 0.65 258 -0.7286 0.2573 0.0882 0.65 270 -0.6261 0.2801 0.0773 0.65 282 -0.3557 0.3928 0.0504 0.75 162 0.0304 0.4605 0.0302 0.75 174 -0.301 0.4052 0.0455 0.75 186 0.4645 0.3739 0.0608 0.75 198 -0.0295 0.3806 0.0302 0.75 210 0.2345 0.4033 0.0401 0.75 222 0.3551 0.4414 0.0503 0.75 234 0.1816 0.4983 0.0364 0.75 246 0.1509 0.385 0.0346 0.75 258 0.3347 0.3908 0.0485 0.85 150 -0.3146 0.4048 0.0467 0.85 162 -0.5258 0.3546 0.0669 0.85 174 -0.0619 0.3182 0.0308 0.85 186 0.4195 0.4023 0.0564 0.85 198 -0.2435 0.3415 0.0408 0.85 210 -0.0711 0.3495 0.0311 0.85 222 -0.3007 0.4216 0.0455