Example of the multicomponent modelling for the spectrum of HE 0345+0056. Upper panel: brightest spaxel spectrum of HE 0345+0056 and the best-fit spectral model. The blue green lines refer to the narrow core and the blue lines refer to the broad wing components of Hβ + [O III]. The gray lines refer to the individual emission lines of the BLR Hβ and Fe II lines. The narrow width of the BLR component representing Hβ is due to the fact that HE 0345+0056 is a narrow line Seyfert 1 (NLS1), where the broad line region tends to show narrower Balmer lines. These narrow BLR components are common in these objects (e.g., Mathur et al. 2000; Mullaney & Ward 2008). Lower panel: residual spectrum normalized by the error spectrum. The dark gray shaded area highlights the ±3σ limit and the red dashed line provides the reference to 0.