Example of a normal template and a subtracted spectrum for yttrium at an atmospheric temperature of 4000 K. The upper panel shows a small wavelength region of the transmission spectrum for a single-species template of Y, i.e. it includes the corresponding continuum-forming species and Y. For this template, the underlying continuum has been removed by subtracting the continuum-only transmission spectrum. The lower panel depicts a subtraction of a spectrum with all species with one that contains all species except Y. This spectrum essentially highlights the effective contribution of Y to the full spectrum.