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tokens: We would like to thank the SPIRITS team (PI: Mansi Kasliwal) for assistance with the inclusion of the SPIRITS data in four of our galaxies and Chris Clark for his help with the P – L distance uncertainty calculation. This work is supported by Spitzer via grant GO11041 and the NASA Astrophysics Data Analysis Program grant No. NNX16AT56G. R.D.G. was supported by NASA and the United States Air Force. O.C.J. has received funding from the European Union’s Horizon 2020 research and innovation program under Marie Sklodowska-Curie grant agreement No. 665593 awarded to the Science and Technology Facilities Council.