CLAS physics database search results Measurement E159M13 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.932201 0.30728 27 1.02369 0.229955 45 1.06346 0.18388 63 1.10455 0.202823 81 1.23949 0.219507 99 1.4717 0.268117 117 0.664916 0.139271 135 0.570655 0.989247 153 0.437643 0.546346 171 0.375429 0.826903