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tokens: We thank the anonymous referee for providing constructive comments that have improved the contents of this paper. We thank Ronin Wu for sharing PACS observations. STO2 is a multi-institutional effort funded by the National Aeronautics and Space Administration (NASA) through the ROSES-2012 program under grant NNX14AD58G. This research was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Y.S. acknowledges support from the NASA postdoctoral program. M.G.W. was supported in part by NSF grant AST-1411827. C.K. was supported through NSF grant AST-1410896. Kristina Davis is currently supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-1801983.