CLAS physics database search results Measurement E18M28 E89-004 R. A. Schumacher 2005 cos(theta) Cz Data errors dimensionless dimensionless dimensionless -0.75 1.015 0.296 -0.55 0.487 0.372 -0.35 1.266 0.307 -0.15 0.502 0.326 0.05 1.016 0.322 0.25 0.779 0.189 0.45 1.147 0.128 0.65 0.638 0.099 0.85 0.61 0.121