Original: Available photometric studies add further credibility to the common origin thesis : three of the moons of the family ( Harpalyke , Praxidike and Iocaste ) display similar gray colors ( average color indices : B V = 0.77 and V R = 0.42 ) while Ananke itself is on the boundary between gray and light red .
Simplified: Three of the moons of the family ( Harpalyke , Praxidike and Iocaste ) display similar gray colors while Ananke itself is on the boundary between gray and light red .