CLAS physics database search results Measurement E159M697 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.270328 0.12156 27 0.699972 0.146836 45 0.942685 0.183613 63 0.867918 0.140635 81 0.713272 0.107637 99 0.791422 0.114279 117 0.979687 0.148207 135 0.762192 0.249378 153 0.633709 0.40915 171 0.626157 0.544938