CLAS physics database search results Measurement E18M29 E89-004 R. A. Schumacher 2005 cos(theta) Cx Data errors dimensionless dimensionless dimensionless -0.75 -0.79 0.385 -0.55 -0.697 0.422 -0.35 -0.253 0.402 -0.15 -0.521 0.366 0.05 -0.097 0.278 0.25 0.107 0.231 0.45 0.191 0.156 0.65 -0.393 0.334 0.85 -0.416 0.157