CLAS physics database search results Measurement E216M413 CLAS12 Run Group A Krishna Chandra 2018 theta(pi+) dsigma/d(−cos(theta_pip)) Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 9 0.636768 0.141598 0.10372796 27 0.590915 0.0387704 0.04993499 45 0.640533 0.0260122 0.05536155 63 0.618523 0.0210646 0.05012537 81 0.623088 0.0195147 0.04993525 99 0.631895 0.0241391 0.0494868 117 0.600322 0.0237323 0.0704702 135 0.620243 0.021833 0.13990323 153 0.584667 0.0460483 0.2569834 171 0.831347 0.00219489 0.43628797