CLAS physics database search results Measurement E159M813 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 0.904234 0.235764 27 0.947665 0.178128 45 1.18757 0.193851 63 1.16536 0.18549 81 1.31946 0.213422 99 1.03397 0.168758 117 0.953077 0.170858 135 1.06449 0.187002 153 1.08951 0.218517 171 0.5374 0.152464