Fig. 13. Result of chi-squared fit (of Eq. 11) to the distribution of Fig. 12. The scale height ratio -population plane is shown. The 90% and 90% confidence bounds are shown as dashed and solid lines. The 10% confidence bound is shown as dotted line. The fit has been applied to distribution (part of upper hemisphere). The bar gives the estimate derived from the galactic population, cf. Sect. 4.4.