CLAS physics database search results Measurement E159M112 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 3.53024 0.638817 27 4.53274 0.696105 45 3.9165 0.58881 63 4.27881 0.614287 81 4.59308 0.622761 99 4.72154 0.651509 117 4.37873 0.606209 135 2.98507 0.989247 153 1.56467 0.928838 171 1.63422 1.19489