Upper panel: Order 32 of the spectrum of VV CrA SW without normalisation (solid black line). In blue are the data points selected to fit the continuum using a sigma-clipping of 3 and 2 iterations. The spline fit of order 3 is plotted in red with a number of knots of 2. The two regions with emission lines were manually removed using the interactive tool. Lower panel: Same spectrum after normalisation. The dashed red line shows the continuum normalised to 1.