Effect of the extinction on the spectral measurement of the pseudo-continuum and on molecular mapping. Top: extincted best-fit BT-Settl models resampled at the SINFONI (gray) and at the GRAVITY (colored circles) spectral resolution. Even with high extinction, the broadband absorption features at the edges of the K-band spectrum can be identified. Bottom: spectral features at the SINFONI resolution after the removal of the continuum. Higher extinctions decrease the spectral signatures molecular mapping is looking for, impeding the detection of molecules.