photometric calibration [and uncertainties in the RDI subtraction]{}. We removed the spectral parts at $\sim$1.34–1.43 $\muup$m because of a strong water telluric absorption band which affects significantly the S/N of the corresponding images. [The S1 region is brighter than S2,]{} as previously noted [@Garufi2013], because of the contribution from [its bright blob feature]{}. [The spectra of the S1 blob feature and of S2 show a red slope in the $H$ band, whereas the spectrum of S1 outside its blob feature looks rather flat. The spectrum of S2 [looks]{} flat in the $K$ band, where S1 appears slightly red. We also note spectral differences at the shortest [wavelengths;]{} S2 and the S1 blob [look red,]{} while the S1 regions outside its blob feature have a flatter spectrum. However, we stress that these [S1]{} regions are poorly detected at wavelengths shorter than 1.13 $\muup$m because of the overlapping of remaining residuals from the AO correction radius ($R_{\rm{corr}}$=$N_{\rm{act}}$$\times$$\lambda/2D$, with $N_{\rm{act}}$ the number of actuators on one side of the deformable mirror). The scattering efficiency [is higher]{} at longer wavelengths for S2, while for S1 it increases [across]{} the $YJH$ bands [and]{} then flattens in the $K$ band. This feature was also seen for 