CLAS physics database search results Measurement E159M472 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.831758 0.256401 27 1.11387 0.233 45 0.921302 0.15358 63 1.15174 0.192105 81 0.957007 0.165862 99 1.11041 0.153745 117 1.05944 0.178836 135 0.865442 0.232591 153 0.568577 0.377508 171 0.540044 0.501467