Ratio between the PAH_3.3 flux emasured using F360M and F480M vs F335M and F480M for continuum modelisation. The ratio is measured pixel by pixel for all the 5σ pixels in the maps of the galaxies analysed in this work. On the x-axis, the PAH_3.3 intensity measured using the F335M-F480M continuum is reported. The dashed grey line is the constant unitary line. The red line is the best fit of the points in the graph.