Dissecting the molecular structure of the Orion B cloud: insight from principal component analysis

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Table 1

Properties of the observed spectral lines. The last six columns show the statistics of the data before and after asinh reparametrization.


				Original data				After asinh reparametrization
Molecule	Transitions	Frequency	Noise	Min.	Median	Max.	Std.	Min.	Median	Max.	Std.
		(MHz)	(K)	(K)	(K)	(K)	(K)	(K)	(K)	(K)	(K)


	J = 1 → 0	115 271.202	0.09	−0.39	13.40	57.11	10.18	−0.37	2.39	3.32	0.91
	J = 1 → 0	110v201.354	0.04	−0.19	1.38	36.43	3.27	−0.19	0.97	3.03	0.74
CS	J = 2 → 1	97 980 .953	0.06	−0.36	0.06	15.53	0.48	−0.35	0.06	2.48	0.23
HCN	J = 1 → 0,F = 2 → 1	88 631 .848	0.10	−0.58	0.15	10.32	0.39	−0.52	0.15	2.22	0.25
HCO⁺	J = 1 → 0	89 188 .525	0.09	−0.45	0.26	8.07	0.47	−0.42	0.25	2.07	0.30
SO	N = 3 → 2,J = 2 → 1	99 299 .870	0.06	−0.43	0.04	6.46	0.24	−0.40	0.04	1.92	0.17
CN	N = 1 → 0,J = 3/2 → 1/2,F = 5/2 → 3/2	113 490.970	0.09	−0.58	0.10	6.33	0.27	−0.52	0.09	1.91	0.20
HNC	J = 1 → 0	90 663 .568	0.08	−0.49	0.07	6.01	0.27	−0.45	0.07	1.88	0.19
CCH	N = 1 → 0,J = 3/2 → 1/2,F = 2 → 1	87 316 .898	0.12	−0.62	0.08	5.72	0.22	−0.55	0.08	1.85	0.18
C¹⁸O	J = 1 → 0	109 782 .173	0.06	−0.30	0.06	5.55	0.42	−0.29	0.06	1.83	0.26
N₂H⁺	J = 1 → 0,F1 = 2 → 1,F = 3 → 2	93 173 .764	0.08	−0.44	0.00	4.53	0.13	−0.41	0.00	1.70	0.10
CH₃OH	J = 2 → 1,K = 0 → 0, (A +)	96 741 .375	0.06	−0.34	0.01	2.24	0.08	−0.32	0.01	1.26	0.08

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