Surface density Σ (R) of old giant stars in the GC for three different K_S -band intervals. The observed surface densities and associated error bars are taken from Gallego Cano et al. (2018) and are shown by circles for the different magnitude intervals. Black dashed lines and triangles show the profile that we obtain for giant stars at the end of our simulations. The profiles are in excellent agreement with each other in the different magnitude intervals, with the exception of the innermost density profile of stars in the magnitude interval 12.5 < K_S < 16.