CLAS physics database search results Measurement E151M430 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.65 138 0.0512 0.7421 0.0302 0.65 150 -0.5513 0.7128 0.0454 0.65 222 -0.606 0.7068 0.048 0.65 234 0.2905 0.703 0.035 0.75 234 -0.7872 0.6521 0.0572 0.75 246 -0.4344 0.6544 0.0403 0.85 210 0.5561 0.7142 0.0457 0.85 222 0.7555 0.6891 0.0556 0.85 246 0.0928 0.5903 0.0305 0.55 210 -0.0852 1.0752 0.0304 0.55 222 0.8215 1.2787 0.0579 0.55 234 -1.0965 0.702 0.0725 0.65 138 0.0656 1.1588 0.0303 0.65 150 4.2292 4.2292 0.2564 0.65 222 2.4314 1.1755 0.1495 0.65 234 0.687 1.2545 0.0511 0.75 234 -0.4178 0.7734 0.0392 0.75 246 0.8347 0.9936 0.0585 0.85 126 -1.1347 0.7446 0.0746 0.85 222 -0.1311 0.8687 0.031 0.85 246 0.2053 0.9861 0.0324