comparison of Sérsic index measurements for galaxies measured with ground-based $K$-band imaging and HST $H$-band imaging, using the subsample of $\sim$9% of galaxies within the UDS CANDELS mosaic. The upper panel compares individual galaxies, with a characteristic error bar denoting the median uncertainty in $\log_{10}(n)$ for the PSB population. We find that ground-based determinations of Sérsic indices are sufficient to broadly distinguish populations with high average values from those with low average values. The lower (binned) distribution compares the mean Sérsic indices, binned as a function of $n_{\rm
        CANDELS}$. Open symbols denote mean values determined from fewer than 5 galaxies. There are deviations from a 1:1 relation, but no evidence for a systematic bias in ground-based Sérsic determinations with spectral type. Galaxies shown have photometric redshifts in the range $1<z<2$ and stellar masses with log (M$_{\ast}$/M$_{\sun}$)$>10$, to match the samples used in this work. []{data-label="fig:sersic-test"}](ntest.pdf "fig:"){width="0.9\linewidth"} ![ A comparison of Sérsic index measurements for galaxies measured with ground-based $K$-band imaging and HST $H$-band imaging, using the subsample of $\sim$9% of galaxies within the UDS CANDELS mosaic. The upper panel compares individual galaxies, with a characteristic error bar denoting the median uncertainty in $\log_{10}(n)$ for the PSB population. We find that 