New issue 783: HOP and FOF Halo Finders don't allow exclusive non-DM particles https://bitbucket.org/yt_analysis/yt/issue/783/hop-and-fof-halo-finders-dont... Desika Narayanan: I would find it useful to have the HOP and FOF Halo finders that ship with yt (3.0) be able to identify groups of particles that aren't dark matter particles (in particular, to link together only gas particles). Responsible: MatthewTurk