GTC/OSIRIS optical spectrum of 2MASS J0249−0557 c (black) compared to other known young L objects (coloured) from Cruz et al. (2009, 2MASS 1022 + 5825, 2MASS 0501−0010 and 2MASS 0355 + 1133) and Zapatero Osorio et al. (2014, 2MASS 0045 + 1634 and G196–3B). The GTC/OSIRIS spectrum was convolved with Gaussians to match the young L1–L3 template spectra resolutions. For the L4–L5 comparisons, the template spectra were convolved to match the target spectral resolution. Spectra were normalised at wavelength ~ 9200 Å and shifted by a constant for clarity. Some spectral features are marked in grey.