An example of a model of a starburst spectrum (SDSS SpecObjId 81288133269782528). Displayed are the two model components – a young (blue line) and an old (red line) stellar population. The sum of the model spectra (dark green line) is shown on top of the observed spectrum (light green). The observed spectrum has been smoothed with a triangular filter with a width of 7 pixels. The shaded areas indicate regions we have flagged to avoid strong emission lines in the fits. Note however that EW_Hα,em is used as a separate criterion in the fitting.