Average Levels of Cooperation (IMAGE) University of Leicester Caption This shows the average level of cooperation over 10,000 generations of evolution. The blue lines represent cooperation between similar pairs, and the red line cooperation between dissimilar pairs. Each of the six panels is a different strategic structure, starting with (a) Prisoner's Dilemma. Credit University of Leicester Usage Restrictions Use with credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.