Zoom-in on the N V P Cygni profile of ID53. Here we show the combined and individual model spectra of an example model with a two-component SFH. We stress that this model is not a unique solution and acts as an example for the discussion in Sect. 8.2. This model could be applicable to ID53 because of its clumpy appearance in the HST morphology and could solve the possible difference between the intrinsic and inferred Hα luminosities (Sect. 5.1).