CLAS physics database search results Measurement E45M2 N/A 0 Q^2 sigma Data errors GeV2 mcb mcb 2.35 5.61646 0.787323 2.95 3.46186 0.485977 4.352 1.26156 0.17853 4.85 0.893552 0.127752 5.353 0.554035 0.081466