Top panel: variation of the a_IR coefficient with the Hα attenuation derived using the Balmer decrement for the Hα+22 μm hybrid tracer. Black squares show galaxies with stellar masses lower than log[M_⋆] < 10.0; gray stars represent galaxies with stellar masses in the range of 10.0 < log[M_⋆] < 10.5; and finally, open circles are for the most massive galaxies with log[M_⋆] > 10.5. Bottom panel: same as previous panel, except this time for the a_IR coefficient, which corresponds to the Hα+TIR hybrid tracer.