Wavelength variation in the average FWHM for the Moffat fitting profile to the narrowband filter images recovered for each of the selected stars in the MUSE HD90177 field labeled HD90177a (see Fig. B.2, left). The dashed black curve corresponds to the wavelength behavior of the ε₀ derived from the average DIMM values during the MUSE observations (see Table 1). The combination of ε₀ and ${ℒ}_0$ best fitting the observations is indicated in the left corner of each panel; the values were obtained by minimizing the residuals, while varying ε₀ and ${ℒ}_0$ values. The purple line corresponds to the wavelength ε_LE variation using ${ϵ}_0^b$ and ${ℒ}_0$^b. The black solid line represents the λ^−1/5 behaviour using ${ϵ}_0^b$.