Projected density distribution for the RC population (triangles) and RRab (circles). The colours show the different catalogues used. The red and purple triangles correspond to the VVV and 2MASS surveys, respectively. The colours of the RRab distribution are the same as in Fig. 1. The solid black line shows the power-law fit for the innermost area of R <  2.2° with a slope of m_RC[1] = −0.64 ± 0.133. The black semi-dashed line shows the best fit for 2.2° < R <  6.5° with a slope m_RC[2] = −1.66 ± 0.100. The best fit for 6.5° < R <  30.0° corresponds to the black dotted line with slope m_RC[3] = −3.41 ± 0.075.