Average spectral reflectance of HD 32297 as measured with method 2, for total intensity data in IFS YJ (in the 0.2–0.8″ range) and IRDIS BB_H (0.2–0.8″ and 0.5–0.8″), as well as polarimetric data in IRDIS BB_J (0.2–0.8″). The NACO K band measurements in the range 0.5–0.8″ (Boccaletti et al. 2012), and an extrapolated value in the range 0.2–0.8″ are over-plotted. The SPHERE Y JH band data are fitted with a straight line (in gray) to estimate a global slope which is (−0.013 ± 0.002) arcsec⁻² per μm.