Column density and deuteration maps calculated assuming a constant T_ex = 9.3 K for all species. Top panels: Column density maps of H₂CS, HDCS, and D₂CS towards L1544. The column density was computed assuming a constant T_ex = 9.3 K for all species. The solid white contours are 30%, 60%, and 90% of the peak intensity of the N(H₂) map of L1544 computed from Herschel/SPIRE data. The dotted white contours indicate the 3σ integrated emission contour with steps of 3σ (, rms_HDCS = 12 mK km s⁻¹, ). Bottom panels: Deuteration maps of H₂CS towards L1544. The column densities were computed using the same T_ex for all species. The column density ratio was only computed in pixels where both molecules have been observed at least at a 3σ level. The solid white contours are 30%, 60%, and 90% of the peak intensity of the N(H₂) map of L1544 computed from Herschel/SPIRE data. The dotted white contours indicate the 3σ integrated emission contour for HDCS in the left panel, and of D2CS in the central and right panel.