CLAS physics database search results Measurement E18M32 E89-004 R. A. Schumacher 2005 cos(theta) Cz Data errors dimensionless dimensionless dimensionless -0.75 0.396 0.41 -0.55 0.281 0.669 -0.35 1.102 0.369 -0.15 1.17 0.471 0.05 0.525 0.596 0.25 0.39 0.29 0.45 0.809 0.235 0.65 0.698 0.145 0.85 0.504 0.164