Extraction of f_AGN and L_IR as a function of AGN contribution and PAH fraction. The AGN fraction is well recovered over the entire parameter range probed by the test, with an error of < 0.1 at both z = 1 and z = 2. The IR luminosity is recovered to better than 0.12 dex at z = 1, and with a dispersion of lower than < 0.25 dex at z = 2. Top row: Panels are colour coded according to the standard deviation of the f_AGN − f_AGN, true distribution. Left and right panels present the results at z = 1 and z = 2, respectively. Bottom row panels: Same as top row panels but for the L_IR.