Spectral energy distributions expressed as differential magnitudes (Δ Magnitude) as a function of wavelength (in μm) for different planetary radii and temperatures. The black solid line represents the case with no extinction (A_V = 0), while dashed blue, dotted green and dash-dotted red lines correspond to increasing extinction values (A_V = 10, 20, 30) with progressively higher planetary temperatures (T_P). The orange, green and blue leftward triangles indicate the upper limit by (Maire et al. 2017) in H, K₁ and K₂ bands. The red point indicates the contrast observed in this study. Each panel corresponds to a specific planetary radius: Top left:R_P = 2.2R_J, Top right:R_P = 3.5R_J, Bottom left:R_P = 2.2R_J with a CPD contribution (T_CPD), and Bottom right:R_P = 3.5R_J with a CPD contribution.