Dust emissivity index (purple dots) of the envelope of L1527 as a function of radial scales. The solid dots indicate the β computed fitting all available bands. The dashed orange line is the best model for the profile of β along scales, while the light orange lines are a subsample of the results of some chains of the fitting procedure. The black line shows the approximation in which β = α_fit − 2, where α is the slope of the SED considering all available bands.