Open Access
Table 7
Species column densities (in cm−2) in C4.
| Warm conditions | Cold conditions | |||
|---|---|---|---|---|
| Molecule | N (cm−2) |  |
N (cm−2) |  |
| H2CO | 3.6 × 1012 | 1.7 | 3.7 × 1012 | 1.3 |
| CS | 7.3 × 1012 | 1.7 | 9.0 × 1012 | 1.7 |
| SO | 3.1 × 1012 | 1.6 | 5.9 × 1012 | 1.6 |
| NO | ≤5.0 × 1013 | − | ≤8.0 × 1013 | − |
| HNO | ≤8.0 × 1011 | – | ≤3.0 × 1011 | − |
| HCO+ | 5.9 × 1011 | 1.2 | 5.8 × 1011 | 1.2 |
| HCN | 7.3 × 1012 | 0.7 | 5.9 × 1012 | 0.6 |
| HNC | 8.6 × 1011 | 1.0 | 6.6 × 1011 | 0.9 |
| CN | ≤1.0 × 1013 | − | ≤1.0 × 1013 | − |
| CCH | 6.6 × 1012 | 0.9 | 9.9 × 1012 | 0.9 |
| CH3OH | 2.4 × 1012 | 3.3 | 4.7 × 1012 | 3.2 |
| C18O | 1.5 × 1015 | 6.2 | 2.2 × 1015 | 5.5 |
| c-C3H2 | ≤8 × 1011 | − | ≤6 × 1011 | − |
| l-C3H2 | ≤2 × 1011 | − | ≤7 × 1009 | − |
| CH3CN | ≤1 × 1011 | − | ≤1 × 1011 | − |
| C3N | ≤2 × 1012 | − | ≤9 × 1012 | − |
| c-C3H | ≤ 3 × 1012 | − | ≤3 × 1012 | − |
| l-C5H2 | ≤4 × 1011 | − | ≤5 × 1010 | − |
| HNCCC | ≤1 × 1011 | − | ≤5 × 1011 | − |
| HCCNC | ≤5 × 1011 | − | ≤2 × 1012 | − |
| H2CCN | ≤2 × 1011 | − | ≤9 × 1008 | − |
| HCCCN | ≤1 × 1011 | − | ≤4 × 1011 | − |
| l-C4H2 | ≤3 × 1011 | − | ≤2 × 1010 | − |
| N2H+ | ≤4 × 1011 | − | ≤3 × 1011 | − |
| H2CS | ≤6 × 1011 | − | ≤7 × 1012 | − |
Notes. See Table 3 for the corresponding ‘warm’ and ‘cold’ conditions. Boldface indicates the smallest χ2 if both conditions do not give the same value. 
stands for reduced χ2.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.