Mean grain radius ⟨ a ⟩ [μm] interpolated across the globe (assuming latitudinal (north-south) symmetry) of HD 189733b. Top row: 10^-4 bar, 10^-3 bar. Middle row: 10^-2 bar, 10^-1 bar. Bottom row: 1 bar, 10 bar, respectively. The sub-stellar point is at φ = 0°, θ = 0°. The largest mean grain radii of cloud particles are generally found on the dayside at all pressure levels. Consequently, cloud particles on the dayside are larger than their pressure level counterparts on the nightside. Note: each plot contains a different colour scale.