morphology of the OES region. First, we note that the sub-regions 1, 2, 3, and 6, corresponding to the blue regions, have very thin ($\sim$10 pc) dust clouds located at $\sim$70-90 pc. As it is believed that inner X-ray cavities of hot gas confront the ambient dust clouds in the OES, the model result of thin dust layers in these sub-regions may be the front boundary of the OES shell encompassing the hot cavity. The clouds may have become thin as they were blown out by the stellar winds or supernova explosions that produced the hot cavity. Sub-region 1 includes the MBM 20 molecular cloud [@mag85], which @bur93 placed at the interface between the OES bubble and the Local bubble. While @jo11 also estimated its location to be in front of the OES bubble because the cloud seemed to block the FUV emission from the OES, the present model does not constrain its distance to be nearer than the clouds associated with the OES in the sub-region, perhaps either because the number of pixels relevant to MBM 20 is too small to affect the simulation result or because there are no stellar sources that can discriminate its distance from the 