Table 2
Observational details.
| Frequency bands | rms(a) | Weather | Tsys |
|---|---|---|---|
| cond. | |||
| (GHz) | (mK) | τ | (K) |
| APEX 12 m, position switching | |||
| 217.000–221.000 | 7.8–12.8 | 0.071–0.147 | 160–173 |
| 249.914–253.915 | 23.3 | 0.139 | 208 |
| 316.222–320.223 | 12.3–47.6 | 0.151–0.309 | 240–296 |
| IRAM 30 m, position switching | |||
| 83.886–91.665 | 6.6 | 0.057 | 150 |
| 126.878–135.159 | 2.0 | 0.081 | 119 |
| 142.558–150.838 | 2.1 | 0.081 | 119 |
| 218.070–225.850 | 45.7 | 0.317 | 702 |
| IRAM 30 m, frequency switching | |||
| 87.064–94.844 | 2.8–3.6 | 0.052–0.101 | 140–158 |
| 143.055–150.838 | 3.6–5.0 | 0.106–0.262 | 170–232 |
Notes. (a) The rms level depends on the time of integration and was different for each source and frequency band, e.g., the best APEX result was achieved for NGC 1333-IRAS 2A (position 1) with a 171 min integration time at 219 GHz with an rms of 7.8 mK. The best IRAM rms (=2.0 mK) level was reached for L1551-IRS 5 for the HOOH transition at 131.396 GHz with an integration time of 325 min.
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