Hi all, Dave and I were chatting a couple weeks ago, and it became clear to me that yt currently does something incorrectly with ghost zones and smoothed covering grids. As it stands, in the smoothed covering grids and the vertex centered data, the fields that are interpolated between points are logged, then interpolated, then 10^values is returned. This is not how Enzo does it, and I think yt should change too. This may change some user-facing behavior, so I wanted to clear it with everyone here first. This would change primarily the generation of ghost zones, which are used for some finite stencils and for the volume rendering. (However, I have been unable in my tests to see any changes in the volume rendering.) What do you all think? -Matt