Table 1.
Basic characteristics of the sources studied in this paper.
| Aperture parameters | ||||||
|---|---|---|---|---|---|---|
| Source | Type | l | b | θap | θint | θext |
| (°) | (°) | (′) | (′) | (′) | ||
| ρ Ophiuchi | PDR | 353.05 | 16.90 | 60 | 80 | 120 |
| Perseus | MC | 160.03 | −18.6 | 102 | 102 | 144 |
| W43 | MC | 30.8 | −0.02 | 60 | 80 | 100 |
Notes. The name and the physical type (photodissociation region or molecular cloud) are indicated in the first two columns. Central coordinates are shown in the next two columns. The last three columns show the radii of the aperture and of the background ring that are used in Sect. 4 to extract flux densities.
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