Upper panel: Updated Gaia colour-magnitude distribution for the 2777 stars selected in Paper I using DR3 parallaxes and extinction coefficients. Green dots represent the original complete sample, while pink squares represent the stars observed by now. The yellow shaded box is defined in Paper I (eq. (1)-(4)), and the sky-blue dashed rectangle is the RC parameter space from Khan et al. (2023). Lower panel: Sky distribution (Mollweide projection) in Galactic coordinates. The colours are the same as in the upper plot.