CLAS physics database search results Measurement E159M301 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.05337 0.196943 27 1.68328 0.260945 45 1.54278 0.228228 63 1.79605 0.24993 81 2.15608 0.292889 99 1.92366 0.260766 117 1.82857 0.253519 135 1.97341 0.395708 153 1.26827 0.747116 171 1.45386 0.954999