New issue 814: NMSU-ART periodicity https://bitbucket.org/yt_analysis/yt/issue/814/nmsu-art-periodicity
NMSU-ART may have some periodicity issues.
Found by examining the number of particles returned after some operation versus the total number of particles in the data set. This occurs within io.py in the read_particle_selection definition comparing the mask and arr sizes. One particle gets masked out. For dd['specie3','particle_mass'].size it should be 2093021 but returns 2093020.