Understanding molecular ratios in the carbon- and oxygen-poor outer Milky Way with interpretable machine learning

Open Access

Table 2

Statistics of the ratio distribution with either molecule detected shown in Figure 2.

	Count	Mean μ	sth σ	Min	Median	Max	∑_j \|ϕ_j\|
log₁₀(H₂CO/CH₃OH)	40 091	5.06	3.89	– 8.90	6.27	20.34	3.94
log₁₀(C₃H₂ /CH₃OH)	27 418	–0.01	6.81	–17.03	2.44	14.74	7.14
log₁₀(HCO/CH₃OH)	28 873	1.12	6.51	–21.23	3.64	9.84	7.27
log₁₀(CN/HCN)	54 167	–2.90	3.81	–20.62	–2.13	8.62	4.77
log₁₀(HCO⁺/HCN)	53 076	–5.87	5.25	–23.14	–4.40	2.09	5.88
log₁₀(HNC/HCN)	53 033	–1.78	1.91	–15.33	–1.42	0.00	1.77
log₁₀(CS/SO)	56 002	4.56	2.60	–3.21	4.04	23.54	3.11
log₁₀(SiO/SO)	55 397	3.72	2.76	–5.79	3.36	21.67	3.00
log₁₀ (CS/CN)	55 692	3.93	3.59	–3.86	2.89	21.46	4.63

Notes. The first column denotes the number of models that satisfied the detection conditions out of a total of 64 949 models. The middle columns list the basic statistics of these ratios. The last column lists the sum of the average absolute importance for each ratio.

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