Table 3
Impact of adding noise to the line intensities on the predictive power R2 (for translucent medium), measured by the noise level σ1∕2 (in a constantnoise level situation) and the signal-to-noise ratio S/N1∕2 (in a constantS/N situation) for which R2 reaches one half of its value in the absence of noise 
.
| Line intensity ratio |  |
σ1∕2 | S∕N1∕2 |
|---|---|---|---|
| [K km s−1] | |||
| C2H (1−0)/HCN (1−0) | 0.93 | 4.55 × 10−3 | 1.64 |
| C2H (1−0)/13CO (1−0) | 0.92 | 5.00 × 10−3 | 1.61 |
| C2H (1−0)/C18O (1−0) | 0.92 | 5.22 × 10−3 | 1.57 |
| C18O (1−0)/CF+ (1−0) | 0.89 | 1.12 × 10−2 | 1.61 |
| C2H (1−0)/HNC (1−0) | 0.87 | 2.35 × 10−3 | 1.58 |
| SO (3−2)/HCS+ (2−1) | 0.85 | 7.53 × 10−5 | 1.58 |
| 13CO (1−0)/C18O (1−0) | 0.85 | 4.30 × 10−2 | 2.97 |
| SO (3−2)/C2H (1−0) | 0.80 | 2.18 × 10−4 | 1.55 |
| C2H (1−0)/CN (1−0) | 0.80 | 2.26 × 10−3 | 1.60 |
| C2H (1−0)/HCO+ (1−0) | 0.78 | 2.70 × 10−3 | 1.57 |
| HCN (1−0)/CF+ (1−0) | 0.77 | 8.17 × 10−3 | 1.79 |
| HCO+ (1−0)/CF+ (1−0) | 0.77 | 7.77 × 10−3 | 1.62 |
| HNC (1−0)/CF+ (1−0) | 0.77 | 4.67 × 10−3 | 1.61 |
| 13CO (1−0)/CF+ (1−0) | 0.76 | 9.95 × 10−3 | 1.74 |
| CN (1−0)/CF+ (1−0) | 0.75 | 5.32 × 10−3 | 1.90 |
| H2CS (3−2)/C2H (1−0) | 0.75 | 1.00 × 10−5 | 1.54 |
| SO (3−2)/CF+ (1−0) | 0.74 | 5.16 × 10−4 | 1.55 |
| CS (2−1)/SO (3−2) | 0.70 | 4.19 × 10−4 | 1.64 |
| C2H (1−0)/CF+ (1−0) | 0.69 | 9.78 × 10−4 | 1.74 |
| CS (2−1)/C2H (1−0) | 0.69 | 4.52 × 10−4 | 1.57 |
| SO (3−2)/CN (1−0) | 0.67 | 2.06 × 10−4 | 1.53 |
| SO (3−2)/HCN (1−0) | 0.66 | 1.89 × 10−4 | 1.57 |
| HCS+ (2−1)/C2H (1−0) | 0.64 | 8.33 × 10−5 | 1.57 |
| HCN (1− 0)/HNC (1− 0) | 0.64 | 3.38 × 10−3 | 2.18 |
| SO (3− 2)/13CO (1− 0) | 0.63 | 1.65 × 10−4 | 1.54 |
| H2 CS (3− 2)/CF+ (1− 0) | 0.59 | 1.00 × 10−5 | 1.54 |
| CS (2− 1)/HCS+ (2− 1) | 0.58 | 3.39 × 10−5 | 2.00 |
| C18O (1− 0)/CN (1− 0) | 0.56 | 2.09 × 10−2 | 1.75 |
| SO (3− 2)/HNC (1− 0) | 0.53 | 8.33 × 10−5 | 1.58 |
| HCO+ (1− 0)/CN (1− 0) | 0.53 | 2.48 × 10−2 | 1.94 |
| SO (3− 2)/C18O (1− 0) | 0.51 | 7.66 × 10−5 | 1.57 |
| CS (2− 1)/CF+ (1− 0) | 0.50 | 8.93 × 10−4 | 1.57 |
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