Robuta

https://www.aanda.org/articles/aa/abs/2007/34/aa4788-05/aa4788-05.html Model colour-magnitude diagrams of elliptical galaxies | Astronomy & Astrophysics (A&A) model colour elliptical galaxies astronomy astrophysics magnitude diagrams https://nla.gov.au/nla.obj-3751199821/view Colour photograph - Model colour photograph model