CLAS physics database search results Measurement E159M382 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 2.81763 0.494245 27 2.85341 0.434618 45 2.18612 0.328265 63 2.81356 0.388666 81 2.72087 0.413727 99 2.84498 0.39682 117 2.75646 0.390901 135 2.26057 0.502338 153 1.80657 1.16134 171 1.95056 1.26973