Dear all, I’m new to YT. I encountered a problem when trying to plot the divergence and vorticity of a velocity field with an octree data structure similar to FLASH. I put a cylindrically symmetric velocity field into YT. So far I could get Velocity Magnitude Plot correctly and the Velocity vector looks also fine (see the attachment). However, the VorticityMagnitude and DivV plots have a offset toward the top right corner. I was wondering where I did it wrong. Any suggestion will be welcome, and thanks for the help in advance. Sincerely, Jia-Hung