Spectroscopic redshift distribution of the u − k − IR sample used in this work. Panel a: gray shaded area shows the total sample while the colored lines show the survey of origin. The black spike located for clarity at z = −0.1 shows the number of stars in the sample. Panel b: Magnitude distribution for SDSS (red) and CFHTLS (blue) surveys comprising 80% and 20% of the galaxy sample respectively. The stars are shown with grey colour on this plot.