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tokens: GMA and BV acknowledge financial support from the ERASMUS–ASTROMUNDUS programme hosted by the University of Innsbruck, where this article was conceived in 2013. We thank an anonymous referee for useful comments that have greatly improved the quality of the article. BV, MMC and MM acknowledge financial support from the Ministry of Education, Science and Technological Development of the Republic of Serbia through the project #ON176021 ‘Visible and invisible matter in nearby galaxies: theory and observations’.