tokens: We thank the anonymous referee for constructive suggestions that improved the quality of the manuscript. The authors wish to thank I.(K.) Lee, A. Stutz, B. Reipurth, J. Jorgensen, A. Kraus, and L. Tychoniec for useful discussions regarding this work. J.J.T. is currently supported by grant 639.041.439 from the Netherlands Organisation for Scientific Research (NWO). J.J.T. acknowledges past support provided by NASA through Hubble Fellowship grant #HST-HF-51300.01-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. L.W.L. acknowledges support from the Laboratory for Astronomical Imaging at the University of Illinois and the NSF under grant AST-07-09206. Z.Y.L. is supported in part by NSF1313083 and NASA NNX14AB38G. C.M. acknowledges financial support from the U.S. National Science Foundation through award AST-1313428. M.M.D. acknowledges support from the Submillimeter Array through an SMA postdoctoral fellowship. This research made use of Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration, 2013, http://www.astropy.org ). This research made use of APLpy, an open-source plotting package for Python hosted at http://aplpy.github.com . This research has made use of NASA's Astrophysics Data System. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Facility: VLA
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