The phrase "data courtesy" means that the information or data being used or provided is given as a kind gesture or favor, rather than being owned or created by the person using or providing it. Full definition
(Actin: Orange, Tubulin: Green): Image data courtesy of: Hatsuho Kanoh1, Toru Kamitani1, 2, Hirofumi Sakaguchi2, Sachiko Tsukita1 1Graduate School of Frontier Biosciences and Graduate School of Medicine, Osaka University 2Department of Otolaryngology - Head and Neck Surgery, Kyoto Prefectural University of Medicine (olympus-lifescience.com)
Image data courtesy of: Yuji Ikegaya, PhD Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo (olympus-lifescience.com)
Table 1: Summary of precipitation data from the Rocky Mountain front ranges and stations in the southeast interior region of BC (data courtesy Environment Canada). (pacificclimate.org)