Hi, I have been messing around with the example light cone generator example for halos: http://yt-project.org/doc/cookbook/index.html#cookbook-light-cone-halo-mask and I have come across a few issues. My guess is that the various things the light cone uses (the halo profiler, FRB) have changed underneath the light cone. I think I've got it working with some changes, but at least one is not a good permanent solution, and I'd like Britton eyes on this since I don't really understand all the details of the LC and I'm not sure that these changes are good. 1. In the example above, the "add_redshift_label" keyword to "project_light_cone()" doesn't appear to exist any more. 2. I've made these changes to the yt source to get things to work: http://paste.yt-project.org/show/2466/ a. The changes to halo_mask.py are hacks. It appears that the halo profiler now adds the overdensity factor to "RadiusMpc" and "TotalMassMsun" (e.g. "RadiusMpc_200"). It seems to me that the correct way to fix this is to pass the halo profiler kwargs down to the _make_slice_halo_list() function where these lines appear so the overdensity factor can be included in these strings. What do you think? b. In light_cone.py I've changed the default of set_parameters to an empty dict, which dict.update() accepts to perform no action, when None makes it croak. c. frb.field_data[] doesn't appear to work. Thanks! -- Stephen Skory s@skory.us http://stephenskory.com/ 510.621.3687 (google voice)