CLAS physics database search results Measurement E159M373 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 2.61166 0.457607 27 3.03136 0.482583 45 2.8757 0.437809 63 2.73031 0.377028 81 2.79561 0.385469 99 3.25803 0.452182 117 2.95339 0.412841 135 2.29712 0.512249 153 1.7357 1.07314 171 2.00124 1.29397