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Retrieved from: https://www.theguardian.com/science/blog/2015/may/05/the-ultimate-coalition-what-the-average-face-of-a-party-leader-looks-like-in-2015.
Also published on PetaPixel Photography:https://petapixel.com/2015/05/08/the-ultimate-coalition-averaging-the-portraits-of-uk-political-leaders/.