CLAS physics database search results Measurement E159M211 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 5.33696 0.947218 27 4.44927 0.724664 45 3.77287 0.624675 63 3.65161 0.570977 81 3.21051 0.491073 99 3.63705 0.551866 117 3.79461 0.575255 135 3.61744 0.989247 153 1.95811 1.22441 171 1.88588 1.3194