WORK ON PROGRESS : Correlator dS_k/dtheta

e=-0.9, Jz=0.5, J=2, alpha=0.5, rotation about Sx angle theta, N=101,201,401,801

e=-0.9, Jz=0.5, J=2, alpha=0.5, rotation about Sx angle theta, N=101,201,401,801 C_x,y,z