Hi Selena, I feel so dumb! Of course I should have put a link in the article. There were a lot of news stories about it published in 2015 and I eventually tracked down the original and got the better-quality picture I put ... The article is "Topography of social touching depends on emotional

bonds between humans" by Juulia T. Suvilehto et. al. 2015 in PNAS

https://www.pnas.org/doi/pdf/10.1073/pnas.1519231112