Colour-magnitude diagram indicating locations of our targets (coloured stars) at the L-T transition. The location of VHS 1256 b has also been included as a cyan circle. Planets in the HR 8799 system are also indicated as black circles. PSO J318 is indicated as a pink circle. The coral points are M dwarfs, dark red points are L dwarfs, and blue points are T dwarfs. Photometric data for each point was obtained from the Ultracool Sheet (Best et al. 2024).