the front face. The 400 pc $\times$ 400 pc square located at 750 pc from the Sun corresponds to 30$^\circ$ $\times$ 30$^\circ$ angular span in the sky, encompassing the entire OES region of 30$^\circ$ $\times$ 30$^\circ$ of the present study. The bright stars of the TD-1 star catalog, whose 1565 [Å]{} band flux is greater than 10$^{-12}$ ergs [Å]{}$^{-1}$ s$^{-1}$ cm$^{-2}$, were selected as the point sources of stellar photons. The total number of stars is 3,338 for the whole simulation box, 194 of which belong to the region of a 30$^\circ$ $\times$ 30$^\circ$ angular span of the present interest and are shown in Figure \[fig:simul\](a). Incorporation of the additional *Hipparcos* stars did not change the result much, though the *Hipparcos* catalog contains $\sim$3,000 more stars than the TD-1 catalog for the OES region: the total luminosity increase was only $\sim$1$\%$. The stellar luminosities were calculated with the distances adopted from the *Hipparcos* star catalog, together with the extinction corrections made by comparing the observed (B-V) values and the model (B-V) values derived from the Castelli model [@per97; @cas03]. We checked the *E*(*B-V*) values for the 19 OES stars listed in the catalog of @fri92 and found good agreement within 