Assessment of the spectral blending in the 23^rd chip (centred at ~1312 nm). Left panel: Two-dimensional spectrum, showing emission from Luhman 16B and A at the top and bottom, respectively. The vertical lines show the strong absorption from tellurics. Right panel: Median spatial profile (black) along with fitted Moffat functions, Φ_A (orange) and Φ_B (blue). The flux within the 12-pixel-wide extraction apertures includes contamination from the unwanted binary component.