Colour-magnitude diagram (J-Ks) vs. Ks of the 2MXSC galaxies (grey dots). We consider VVV extinction-corrected aperture magnitudes. Crosses show galaxies that were not detected using our methodology; the sources lost by the (J-Ks) cut are shown in pink and two galaxies with unreliable measurements in Z and Y VVV bands in yellow. On the right-hand side of this figure, we plot a densogram based on the (J-Ks) colour distribution of the sources. In the upper panel, we show the completeness in terms of 2MXS galaxies as a function of Ks magnitude.