³²S/³⁴S isotope ratios plotted as a function of the distance from the Sun. The symbol Θ indicates the ³²S/³⁴S isotope ratio in the Solar System. The ³²S/³⁴S ratios with corrections of opacity in the J = 2−1 transition derived from ¹³CS/¹³C³⁴S and obtained from the double isotope method are plotted as black and green dots, respectively. The ³²S/³⁴S ratios without corrections for optical depth in the J = 3−2 transition derived from the double isotope method are shown as light blue dots. The ³²S/³⁴S ratios in Yu et al. (2020) derived from the double isotope method in the J = 2−1 transitions are shown as blue dots. The ³²S/³⁴S values in the CMZ obtained from ¹³CS/¹³C³⁴S in Humire et al. (2020) are plotted as red stars.