OES clouds.

[cccccccccc]{} distance (pc) & 70 & 90 & 90 & 130 & 130 & 90 & 50 & 80 & 80\
thickness (pc) & 10 & 10 & 10 & 10 & 70 & 10 & 130 & 70 & 50

![ *E*(*B-V*) values derived from the dust models of the present study are compared with those for the 19 OES stars listed in the catalog of @fri92.\[fig:cmp\_ebv\]](f5.eps "fig:"){width="7.3cm"}\

Next, we note that the clouds of the sub-regions 7, 8, and 9 all have their centers at a distance $\sim$110 pc, as the distance in the table is actually the distance to the front face of the slab, confirming it to be a single body. Hence, this part of OMCC seems to be located at a distance $\sim$110 pc from the Sun, with its thickness ranging from 130 pc at the core (sub-region 7) to 50 pc at the boundary (sub-region 9). Sub-regions 4 and 5 are located between the two distinct groups of dust clouds mentioned above and the simulation results show quite different thicknesses for the two sub-regions while their distances to the front face are similar. We believe such a discrepancy arose because two different 