CLAS physics database search results Measurement E159M454 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.413269 0.131076 27 0.449094 0.0951533 45 0.580536 0.0961288 63 0.525598 0.0821296 81 0.717066 0.115918 99 0.472701 0.0714424 117 0.512351 0.0981 135 0.551485 0.177481 153 0.386349 0.280439 171 0.335137 0.372632