Table 6: Distance of the gas from the central star and total density of the observed medium, as determined by the best-fitting model using the Meudon PDR Code.
Star Gas to star Gas volume
  distance (pc) density, $n_{\rm H}$ (cm-3)
HD 176386 0.04 3000
HD 250550 0.03 600
HD 85567 0.10 250
HD 259431 0.35 70
HD 38087 1.60 12
HD 76534 0.40 170

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