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Table 2
Spitzer IRS observational parameters and the assumed physical parameters for PDRs with mixed mid-IR populations.
| Object | Position | Aperture | G0 | nH | Ref. |
| [α2000,δ2000] | [cm-3] | ||||
|
|
|||||
| Horsehead | (05:40:53.8; –02:28:00) | 9″ × 7″ | 100 | 2 × 105 | Habart et al. (2005) |
| Ced 201 | (22:13:25; 70:15:03) | 22″ × 22″ | 300 | 4 × 102 | Young Owl et al. (2002) |
| IC 63 | (00:59:01; 60:53:19) | 30″ × 40″ | 1100 | 1 × 105 | Gerin et al. (2003) |
| Parsamyan 18 S | (06:59:41; –07:46:45) | 9″ × 8″ | 3500 | 1 × 104 | Ryder et al. (1998) |
| Parsamyan 18 N | (06:59:41; –07:46:12) | 4″ × 8″ | 5000 | 1 × 104 | Ryder et al. (1998) |
| Orion Bar | (05:35:21.4; –05:25:15) | 4″ × 8″ | 4 × 104 | 2 × 105 | Tauber et al. (1994) |
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