Example of the effect of the errors in the photometry in a density distribution as given by Eq. (5). The example of ρ_X−shape is taken from the predictions of the X-shape bulge of Eq. (9) at ℓ = −5.2°, b = −7.5°. The rms σ(r) is the average of errors of H magnitudes (extinction corrected) in this VISTA-VVV fields for stars in the field with the corresponding apparent magnitude of distance r and absolute magnitude M_H = 2.40.