In the single-point-stats.py file, there is a command: "np.savetxt(fname,np.c_[zc,zf,u1,v1,w1,u2,v2,w2,uw,u3,v3,w3,u4,v4,w4,p1,p2,omx1,omy1,omz1,omx2,omy2,omz2,u2m,v2m,w2m,uwm,visct,uwv])".
It seems that the variables "omx1,omy1,omz1,omx2,omy2,omz2" has not been defined yet? I just wanted to get velocity gradient variables, and noticed these variables.