OSIRIS J1753 averaged spectrum. The upper panel displays the telluric-corrected and dereddened spectrum normalised to unity at 7500 Å. The location of the expected M-type companion star TiO molecular bands are marked with grey bands. The lower panel presents a close up view of the same spectrum after smoothing using a Gaussian with FWHM = 2 pixels. The He I 5876 Å, 6678 Å, and 7065 Å emission lines are highlighted in blue. An M4 V template star (HD 125455B) broadened to match the target spectral resolution is overplotted. The latter has been scaled by a factor of 0.08 to simulate the companion flux contribution in the i-band and shifted in the y-axis for display purposes.