Simulated K_p − v plots to test varying the argument of periastron ω and orbital eccentricity in six different test cases. First row: simulations of a ‘clear’ WASP-107 b that has no cloud deck present cross-correlated with a ‘clear’ template that excludes clouds for three different values of ω, all for a WASP-107 b on a fully circular orbit. Second row: same as the top row but now simulating a ‘cloudy’ WASP-107 b cross-correlated with a ‘cloudy’ template, where both the simulation and template include a cloud deck at P = 10⁻⁵ bar. Third row: same as the first row but now for a WASP-107 b on its true (somewhat) eccentric orbit of e = 0.06. Fourth row: same as the second row but now for a WASP-107 b on its true orbit of e = 0.06.