Table 2: The definition of equivalent width (EW) for the molecular absorption bands. The continuum level is linearly interpolated from the wavelength region in the last column. SiO molecules show three strong bands from 4.0-4.1 $\mu$ m, and $EW_{\rm {SiO}}$ is the total of these three bands.
Name Molecules Measured Continuum

region [ $\mu$ m] [ $\mu$ m]

EW_3.1 HCN, C₂H₂ 2.97-3.35 2.94-2.97, 3.35-3.40

EW_3.5 HCN 3.56-3.58 3.51-3.56, 3.58-3.63

EW_3.8 C₂H₂ 3.60-4.00 3.50-3.60, 4.00-4.10

$EW_{\rm {SiO}}$ SiO 4.0025-4.0200 3.95-3.96, 3.99-4.00

4.0425-4.0600 4.036-4.04

4.0825-4.1000 4.076-4.080

**Table 2:** The definition of equivalent width (EW) for the molecular absorption bands. The continuum level is linearly interpolated from the wavelength region in the last column. SiO molecules show three strong bands from 4.0-4.1 $\mu$ m, and $EW_{\rm {SiO}}$ is the total of these three bands.
Name	Molecules	Measured	Continuum
		region [ $\mu$ m]	[ $\mu$ m]
EW_3.1	HCN, C₂H₂	2.97-3.35	2.94-2.97, 3.35-3.40
EW_3.5	HCN	3.56-3.58	3.51-3.56, 3.58-3.63
EW_3.8	C₂H₂	3.60-4.00	3.50-3.60, 4.00-4.10
$EW_{\rm {SiO}}$	SiO	4.0025-4.0200	3.95-3.96, 3.99-4.00
		4.0425-4.0600	4.036-4.04
		4.0825-4.1000	4.076-4.080

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations
	3 Spectra of oxygen-rich stars
	4 Spectra of carbon-rich stars
	5 Discussion
	6 Conclusion
	References