Mass-density distribution of the galaxy, averaged along elliptical iso-density contours, as inferred from the B07 model (thick grey line; its thickness indicates deviations along each ellipse), the model profile (solid line) and the contributions of the individual stellar components (dashed lines) to the model profile. The contribution of the model population B07-1 to the mass distribution is also shown; it is closely traced by the young disc component of the model.