Reflectance R vs wavelength of (96) Aegle, normalised at 3.5 µm. (a) Background grey circles are quoted from Fraeman et al. (2014), who observed the same asteroid at r_H = 3.1 au. Blue and red curves denote the expected thermal flux derived from the EM and the STM, respectively. (b) Continuum-removed spectrum (ΔR). The upper and lower dashed lines show the ±5% calibration uncertainty. The dashed curve in the background shows the atmospheric transmission curve modelled by ATRAN (Lord 1992) in the same median airmass of (96) Aegle (Table 1). We multiplied the curve by 1.6 to compare the atmospheric pattern to the observed spectrum. The solid vertical line marks the shortest wavelength where the contribution of the thermal flux to the observed flux becomes non-negligible.