Relations at 33 pc (left), 260 pc (centre), and 2084 pc (right) of L_ν(70 μm) versus L_ν(24 μm) (top), and L_ν(100 μm) versus L_ν(70 μm) (bottom). All luminosities have been multiplied by a constant factor corresponding to a linear SFR estimator (a₂₄ = 2.04 × 10^-36M_⊙ yr^-1 W^-1, a₇₀ = 5.89 × 10^-37M_⊙ yr^-1 W^-1, and a₁₀₀ = 5.17 × 10^-37M_⊙ yr^-1 W^-1) to place them on a similar scale. The colour of each point indicates ΣSFR following the colour bar at the right of each row. The red line indicates a one-to-one relation. We see the non-linear relations between the luminosities in different bands. These non-linearities are particularly apparent on the finest pixel scales. On coarser scales, the relations appear more linear, which is probably due to a mixing between diffuse and star-forming regions.