CLAS physics database search results Measurement E151M201 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.55 258 -0.6354 0.2846 0.0501 0.55 270 -0.2744 0.2817 0.0373 0.55 282 0.8122 0.3011 0.0692 0.65 246 -0.2736 0.3082 0.0362 0.65 258 0.2 0.2822 0.0351 0.65 270 -0.2052 0.2532 0.0363 0.75 150 0.2597 0.7096 0.0338 0.75 174 0.041 0.6978 0.0301 0.75 186 0.0597 0.6895 0.0302 0.75 234 0.5177 0.7723 0.0433 0.75 246 -0.8363 0.2967 0.0586 0.75 258 0.0129 0.4903 0.03 0.75 270 -0.3974 0.4196 0.0384 0.85 138 -0.2417 0.5972 0.0333 0.85 150 -0.6362 0.3763 0.0487 0.85 162 -0.1154 0.5866 0.0308 0.85 174 1.6225 1.6225 0.1022 0.85 186 -0.2476 0.5633 0.0335 0.85 198 0.1685 0.5772 0.0317 0.85 222 0.6176 0.7482 0.0478 0.65 282 1.0513 0.4091 0.0717 0.75 246 -0.3855 0.3858 0.0383 0.75 258 -0.229 0.3481 0.0332 0.75 270 -0.4597 0.3456 0.0414 0.85 150 0.6043 0.417 0.048 0.85 162 0.1812 0.3937 0.032 0.85 174 -0.5284 0.3501 0.0444 0.85 186 -0.4071 0.3072 0.0392 0.85 198 -0.1025 0.3749 0.0307