Simulated K_p − v plots used to test the impact of including or excluding cloud decks in four different test cases. Top: simulations of a ‘clear’ WASP-107 b that has no cloud deck present cross-correlated with a ‘clear’ template that excludes clouds (left) and with a ‘cloudy’ template that includes clouds (right). Middle: same as the top row but now simulating a ‘cloudy’ WASP-107 b with a cloud deck present at P = 10⁻⁵ bar, shown with the same colour scale as the test above for comparison. Bottom: same as the middle row but now shown with its own colour scale for reference.