Median values of the difference between the distance d_K and d_J using the K_s band and J -band, respectively; these values are computed for bins of E_B−V, for different galactic latitudes b (in colour as indicated in the plots) in the anticentre fields (two top panels) and centre fields (two bottom panels), and for dwarfs and giants as indicated in the figure. The error bars give the value of the first and third quartile of the distribution for each bin.