Table 5: Mean values for the two groups of OH/IR stars.
$v_{\rm exp} < 18$ km s^-1 $v_{\rm exp} > 18$ km s^-1

Na I 1.57 $\pm$ 0.70 2.44 $\pm$ 1.02

Ca I -0.65 $\pm$ 0.69 0.67 $\pm$ 1.17

¹²CO(2, 0) 15.73 $\pm$ 3.90 15.61 $\pm$ 3.44

H₂O -452.90 $\pm$ 190.82 -294.97 $\pm$ 110.31

**Table 5:** Mean values for the two groups of OH/IR stars.
	$v_{\rm exp} < 18$ km s^-1	$v_{\rm exp} > 18$ km s^-1
Na I	1.57 $\pm$ 0.70	2.44 $\pm$ 1.02
Ca I	-0.65 $\pm$ 0.69	0.67 $\pm$ 1.17
¹²CO(2, 0)	15.73 $\pm$ 3.90	15.61 $\pm$ 3.44
H₂O	-452.90 $\pm$ 190.82	-294.97 $\pm$ 110.31

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