Upper panel: Zoom-in of the β_UV slope region of the spectrum (grey). The blue region is used for calculating the fiducial beta slope, and the orange dashed line is the best-fit fiducial β_UV slope from the observed spectrum. Kron convolved photometry is overplotted as green points, and the best-fit β_UV slope from it is shown with green dashed lines. The black dotted line is the PPXF best fit to the continuum emission. We observed that the orange spectroscopic β_UV slope fit accurately traces the PPXF continuum fit despite these being fit completely independently. We also overplot the best-fit prospector spectrum in purple to show that it cannot match the β_UV slope measured from the photometry or spectroscopy. The lower panel shows the χ values for the spectroscopic β_UV slope fit compared to the spectrum. We extended the wavelength range beyond the fitted region to show the goodness of fit even after extrapolation (at least until the Lyman α break).