RADEX modelling results of the selected SO line ratios. From left to right are the three ratios: J = 7₈ –6₇/J = 7₇–6₆, J = 7₈ –6₇/J = 8₇–7₆ and J = 7₇–6₆/J = 8₇–7₆. The solid black line is the observed line ratio and the dotted black lines are the error bars. The shaded region highlights the temperature and density conditions chosen for the location of the SO in the LIME modelling.