The radial velocities (RVs) during the transit event of TOI-942c on 2021 November 25th (UTC), measured by Keck/HIRES spectra. In the upper subplot, the solid red line is the best-fit model (﹩\left|\lambda \right|={24}_{-14}^{+14\circ }﹩), incorporating the Rossiter–McLaughlin effect and RV long-term trend. The solid gray lines are the solutions randomly selected from the Markov chain Monte Carlo sampling. In the lower panel, the residuals are given by subtracting the best-fit model.