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tokens: ACKNOWLEDGEMENTS We thank Matt Smith for kindly providing the M31 β map. TED wishes to thank Prof. Chung-Ming Ko at National Central University for his support of this project. We also want to thank Jesús Toalá, whose insights in the data encouraged us to pursue this project. This research has been supported under grant MOST104-2628-M-001-004-MY3 from the Ministry of Science and Technology of Taiwan. AZ acknowledges support from the UK Science and Technology Facility Council under grant ST/L000768/1. JC is supported by an NSERC Discovery Grant. The JCMT is operated by the East Asian Observatory on behalf of The National Astronomical Observatory of Japan; Academia Sinica Institute of Astronomy and Astrophysics; the Korea Astronomy and Space Science Institute; the Operation, Maintenance and Upgrading Fund for Astronomical Telescopes and Facility Instruments, budgeted from the Ministry of Finance of China and administrated by the Chinese Academy of Sciences, as well as the National Key RD Programme of China (No. 2017YFA0402700). Additional funding support is provided by the Science and Technology Facilities Council of the United Kingdom and participating universities in the United Kingdom and Canada. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. This research used the facilities of the CADC operated by the National Research Council of Canada with the support of the Canadian Space Agency. In addition to software cited above, this research made use of the scipy (Jones et al. 2001 ) and astropy (The Astropy Collaboration et al. 2018 ) python packages. This research has made use of the SVO Filter Profile Service (http://svo2.cab.inta-csic.es/theory/fps/) supported from the Spanish MINECO through grant AyA2014-55216. We thank the anonymous referee for refereeing this paper in a timely manner and for their suggestions which lead to the improvement in its clarity.