Upper panel: evolution of the abundance ratio [Fe/H] as a function of the dust-to-gas ratio D/G predicted by our chemical evolution model of the Milky Way disk. As in Fig. 1, the color code indicates different Galactocentric distances. Lower panel: with the black solid line we report the [Fe/H] ratio vs. computed at 8 kpc (solar neighborhood) using the chemical evolution model of the Milky Way. With the green solid line we show the fit obtained by means of a sixth-order polynomial fit. With the red dashed line we report the linear fit at 8 kpc. In both panels with the orange triangle we label the value of the [Fe/H] as a function of the dust-to-gas ratio D/G for the model computed in the solar neighborhood at the Galactic time of 9.5 Gyr (i.e., model solar value).