Normalised optical spectrum of 2MASS J02105640+5845176 (black), as observed with the Intermediate Dispersion Spectrograph at the Isaac Newton Telescope. The best-fitting model spectrum from Munari et al. (2005) is plotted in blue (shifted by +0.4 units vertically) and is characterised by T_eff = 14 000 K, log g = 4.5 cgs, [M/H = 0, and v_rot sin i = 75 km s⁻¹]. The model spectrum has been convolved with the response of the slit to match the resolution of the observed spectrum. The LAMOST DR7 spectrum from Xiang et al. (2022) is shown in orange (shifted by +0.8 units vertically). Prominent absorption lines are indicated.