SED of ℓ Car complemented with ALMA flux density in Band 6 from setup (221 GHz) and 2 (261 GHz) presented in Table A.1 and detailed in Sect. 2. 5σ errors are displayed on the figure for all the data. Flux density for each band is presented in Table B.1. The grey dashed line represent a spectral index of α_ν = +1.26 (equivalent to α_λ = −0.74) as derived in Sect. 3.1. The SED is derived from an ATLAS9 model (derived up to 10 μm and extrapolated beyond) with T_eff and angular diameter corresponding to the epoch of the setup observation, which fits the optical and NIR well. The envelope model of ionized gas of constant density from Hocdé et al. (2021) is shown in yellow. See this paper for a more detailed analysis and a discussion of the impact of free-bound emission in the optical and NIR bands.