Extinction effects on the distance modulus measured via the PNLF. The points show how the distance modulus estimated via a sample of PNe extracted from a PNLF with fixed zero-point and distance modulus (M^* = −4.54 mag and 27.72 mag, respectively) changes when applying an increasing amount of extinction. In this model, both PNe and extinction (dust) follow a Laplace distribution, as described in Sect. 5.4. Different colours represent different ratios between the PNe and dust scale height. The solid horizontal lines represent our measurement of the distance modulus of the galaxy when considering both the full sample (bottom line) and only the PNe close to the centre of the galaxy (top line), while the grey areas represent their uncertainties. The dashed horizontal line represent a distance modulus of 27.72 mag, the expected one from the TRGB-based distances from the literature. Finally, the vertical dot-dashed line represents the average E(B−V) we measured from the extinction map shown in Fig. 13.