Confidence levels for the CPL model. Here we show in grey the 68% confidence level for the strong-lensing-only analyses for better visualisation, and the yellow circle indicates the median values of Table 2. The 68% and 95% combined constraints of different probes are shown with coloured contours. The region where w_a > −w₀ was excluded because it produces a non-physical cosmology. In this cosmology with one additional free parameter, our strong lensing models are still capable of improving the constraints when combined to classical probes, especially on the parameters w₀ and w_a of the dark energy equation of state.