CLAS physics database search results Measurement E159M292 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.09363 0.208352 27 1.98917 0.322128 45 1.65657 0.269098 63 1.68373 0.233461 81 1.87555 0.24885 99 1.97479 0.273422 117 1.82452 0.24489 135 1.82132 0.357493 153 1.22353 0.71338 171 1.29162 0.855829