[yt-users] Axis symmetry for cylindrical (r-z) mesh

Hi all. I want ti do a simulation with FLASH data in 2D cylindrical (r-z) In FLASH code the r axis it's always greater than zero in 2D cylindrical mesh (0<r<500) um i want to do simulation for (-500<r<500 um) using symmetry of axis. How can do that with yt My best regards.