[yt-users] Error with important of AbsorptionSpectrum

Hi all, I recently used conda to install yt, but when I try to import AbsorptionSpectrum, I get this error: http://paste.yt-project.org/show/4246/ I'm not familiar with particle_trajectories, but is this something that is actually needed by AbsorptionSpectrum? If not, should it even being trying to import that? Any thoughts/help are, as always, appreciated. Cheers, Devin -- Devin W. Silvia Research Associate Department of Physics and Astronomy Michigan State University www.devinsilvia.com