Overview of the continuum modelling. Left panel: cross-dispersion profile along the slit at 6500Å. Our best-fit two-component Sersic model convolved with the PSF is shown for comparison. Right panel: optimally extracted spectra of the two components (black line) assuming that the Sersic parameters only smoothly vary with wavelength. The red line represent the best-fit continuum model based on the INDO-US spectral library fitted with PyParadise. The grey shaded areas indicate the regions masked during the continuum fit.