The Weighted Sum and Chimera ASF strategies require parameterization. Weighted Sum received weights of 3, 2, and 1 for the λ abs , E red and G solv objectives, respectively, indicating the preferential order of objective importance. The objective hierarchy of Chimera was organized in the same order. Chimera also received absolute tolerances of 25 nm for the λ abs objective, and 2.04 V for the E red objective.