Predicted brightness temperature for the 1₁₁ − 2₀₂ line of SO₂ at 12.256 GHz for different sets of collisional rates. The assumed kinetic temperature and Δv= are 10 K and 1 km s^-1, respectively. Black(thin)/red(thick) lines correspond to the excitation of the molecule by o-H₂/p-H₂ using the collisional rates calculated in this work. Blue(dashed) lines correspond to the predicted intensity when the scaled He-rates of Green (1995) are used. Column densities are indicated and correspond to 3  ×  10¹⁴, 10¹⁴, 3  ×  10¹³, and 10¹³ cm^-2.