Retrieved constraints on the atmospheric and orbital properties obtained from the observed two transits of WASP-189b. The orange shows the retrieval considering only the HARPS data, while the blue shows with the inclusion of NIRPS. Here the overall metallicity, as well as the titanium-only metallicity are well constrained to be near-solar. Meanwhile the H⁻ abundance is slightly above expectations from solar model in chemical equilibrium. The inclusion of the NIRPS data is particularly helpful in constraining the H⁻ abundance, as well as setting a strict upper limit on the free electron density, which is unconstrained from the HARPS-only retrieval.