Hi all, I'm working on a project where I'm comparing different RAMSES simulations. However I'm running into a problem with memory. It seems that yt loads the whole simulation into memory even though I'm only interested in a number of dark matter halos which I have the coordinates for. It also seems like it doesn't drop the first simulation out of memory when I'm done making the figures I want for that one. This quickly fills up the memory. You can find the relevant parts of my code at the pastebin at http://paste.yt/p4946.html I'm running yt version 3.3.2 What am I doing wrong? Also, is there a way to change the axis names? I'm making some dark matter density profiles using the ('deposit','io_density') field and this gives IO Density on the y axis, but I just want it to say Dark matter density so my readers actually understand what I'm talking about. Thanks for helping Best, Andreas Ellewsen