Line ratios between SO₂ 11_1,11 − 10_0,10, 4_2,2 − 3_1,3 and 12_3,9 − 12_2,10 transitions resulting from different combinations of T_kin − N(SO₂) obtained with RADEX. Black lines show the resulting 11_1,11–10_0,10 over 4_2,2–3_1,3 line ratio, whereas red lines show the 11_1,11–10_0,10 over 12_3,9–12_2,10 line ratio. The thick black and red lines mark the line ratios found in the spectra of peak 2. The dashed black and red lines indicate where other line ratio values are located in the grid. Top: results for n_H2 = 10⁶ cm⁻³. Middle: results for n_H2 = 10⁷ cm⁻³. Bottom: results for n_H2 = 10⁸ cm⁻³.