CLAS physics database search results Measurement E19M14 E89-004 R. A. Schumacher 2005 cos(theta) Cz Data errors dimensionless dimensionless dimensionless -0.7 -0.303 0.579 -0.4 1.215 0.386 -0.1 0.319 0.232 0.2 0.524 0.178 0.5 0.048 0.148 0.8 -0.082 0.178