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tokens: We thank the referee for very helpful comments to improve the presentation of the paper. Y.P.L., H.L., and S.L. gratefully acknowledge the support by LANL/CSES and NASA/ATP. Simulations of this work were performed with LANL Institutional Computing resources. H.L. gratefully acknowledges useful discussions with S. Ida, R. Miranda, and R. Rafikov. Software: Astropy (Astropy Collaboration et al. 2013 ), LA-COMPASS (Li et al. 2005 , 2009a ), Matplotlib (Hunter 2007 ), Numpy (van der Walt et al. 2011 ), RADMC-3D (Dullemond et al. 2012 ).