Top: corrected and phase-folded transit light curve of WASP-189 b. Data from the 15 June 2020 are shown as black circlesand data from 18 June 2020 are shown as blue diamonds. The red and green curves illustrate the best-fit models, including and excluding gravity darkening, respectively. Bottom: data residuals related to each of the models. Green points in the upper panel refer to residuals in the model without gravity darkening and red points in the lower panel refer to that with gravity darkening.