Table 1.
Summary of properties and statistics of the data collected from literature works.
| Reference | Number | Non-det. | Survey name | CO line | Mapping techno. |
|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) |
| Sorai et al. (2019) | 55 | – | COMING | (1–0) | OTF |
| Brown et al. (2021) | 15 | – | VERTICO | (2–1) | INT |
| Groves et al. (2015) | 14 | – | HERACLES | (2–1) | OTF |
| Morokuma-Matsui et al. (2022) | 13 | 6 | (1–0) | INT | |
| Chung et al. (2017) | 10 | – | (1–0) | OTF | |
| Corbelli et al. (2012) | 9 | – | HeViCS | (1–0) | OTF |
| Curran et al. (2001) | 5 | – | (1–0) | OTF | |
| Total | 121 | 6 | |||
Notes. Columns: (1) Reference; (2) Number of objects for each survey or collection; (3) Number of CO nondetections; (4) Survey name; (5) CO emission line transition considered (see the main text for details; (6) Mapping technique, OTF mode with single-dish antenna or mosaic with interferometric (INT) facilities.
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