are 0.43$^{+0.02}_{-0.04}$ for the albedo, 0.45$^{+0.2}_{-0.2}$ for the *g*-factor, 80$^{+40}_{-50}$ pc for the distance to the front face, and 70$^{+60}_{-50}$ pc for the thickness. The 90 $\%$ confidence ranges for both the albedo and the *g*-factor include the theoretical values 0.4 for the albedo and 0.65 for the *g*-factor [@dra03]. It should be noted that the albedo is well constrained with less than 10$\%$ error range for the 90$\%$ confidence. The distance and thickness values indicate that the dust cloud is generally located in front of the OES, whose distance is known to be $\sim$155 pc to the near-side. The wide ranges for the distance and thickness estimated here may actually indicate the large spatial dimension of the cloud along the line of sight, as we will note in the Discussion section.

Discussion
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As mentioned previously, the assumption of a single slab as a model for the dust cloud in the OES is unrealistic, and the ranges of the estimated distance and thickness were rather broad. Here, we would like to improve the model by allowing local variations of the distance and thickness of the cloud. However, we fix the value of albedo to be 0.43, as we obtained 