Temperature sensitivity of the H₂CS line ratios as a function of H₂ density (blue lines) and H₂CS column density (orange lines). For the density plots, a H₂CS column density of 10¹⁴ cm⁻² is adopted for both o-H₂CS and p-H₂CS, and a H₂ density of 10¹⁰ cm⁻³ is used for the column density plots. The line ratio is listed above the panels and contours are for the ratios at temperatures of 50, 100, 150, 200, and 250 K. The blue shaded area shows the change in derived temperature if the 100 K ratio changes by 20%. The blue vertical line represents the typical 3σ error on thetemperature based on the observed uncertainty in the line ratio solely due to the rms in the images. The 7_0,7–6_0,6/7_2,5–6_2,4 ratio is equalto the 7_0,7–6_0,6/7_2,6–6_2,5 ratio (not shown) and the 7_2,5–6_2,4/7_4,3–6_4,2 ratio is equalto the 7_2,6–6_2,5/7_4,3–6_4,2 ratio (not shown).