CLAS physics database search results Measurement E18M36 E89-004 R. A. Schumacher 2005 cos(theta) Cz Data errors dimensionless dimensionless dimensionless -0.75 0.667 0.61 -0.55 0 0.833 -0.35 -0.517 1.211 -0.15 1.129 0.618 0.05 -0.171 0.48 0.25 0.117 0.354 0.45 0.906 0.318 0.65 0.809 0.222 0.85 0.283 0.527