Near-infrared spectral energy distribution of HD 135344 Ab. The black line shows the best-fit model spectrum from Sonora Diamondback, and the gray lines show 30 random samples from the posterior distribution, both shown at R = 500. The SPHERE/IFS and GRAVITY spectra are shown with circular markers, and the latter are downsampled for clarity. The SPHERE/IRDIS photometry is shown by square markers, with horizontal error bars indicating the FWHM of the corresponding filter profiles. The bottom panel shows the residuals of the best-fit model, calculated at the resolution and wavelength sampling of the data.