Comparison of RXJ1131−1231 (solid red) with B1608+656 (dotted blue) in U H ₀ (left) and U wCDM (right) cosmologies. The two distributions overlap within 2σ. The cosmological constraints from the two lenses are statistically consistent with each other: the ratio of the probability that the two lenses share global cosmological parameters to the probability that the lenses require independent cosmologies is 3.2 in U H ₀ and 3.8 in U wCDM.