a: linear correlation between the [NeV]24.3 μm line luminosity and the 19 μm luminosity, expressed in units of 10⁴¹ erg s⁻¹. b: comparison of the three different relations between the [OIV]25.9 μm line luminosity and the BHAR: the blue dashed line reports the relation obtained from the Lusso et al. (2012) bolometric correction, the red dotted line the relation from the Marconi et al. (2004) bolometric correction, and the green solid line the results from the Spinoglio et al. (1995) correction. c: same as panel a, but for the [NeV]24.3 μm line.