**Table 2:** The 34.6 ${\mu }$ m and 1612 MHz line parameters for the three supergiants which are used to estimate the OH maser radiative pump rate. The integrated fluxes $F^{\rm int}_{34.6}$ is in [10^-19 W/cm²], $F^{\rm int,blue}_{\rm OH}$ is in [10^-26 W/cm²] while the equivalent widths EW_34.6 is in [ $10^{-4}~\mu$ m]. Negative values mean that the line is in absorption.
Name	TDT^*	$F^{\rm int}_{34.6}$	EW_34.6	$F^{\rm int,blue}_{\rm OH}$	Pump rate	References1	$F^{\rm int,lit}_{34.6}$	References2^**
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)
IRAS 07209-2540	73103039	-18.7	-18.0	1751	0.052	tL-H(fig) $^{\char93 \char93 }$	-21.0	NEU99
	73402218	-21.4	-20.9
	$\underline{73601963}$	$\underline{-17.6}$	$\underline{-16.2}$
IRAS 19244+1115	31600936	-4.12	-12.6	662	0.042	SYL97	-4.8	SYL97
	$\underline{36401613}$	$\underline{-8.10}$	$\underline{-21.0}$
	36401631	-3.31	-10.3
	72400804	-6.49	-15.9
NML Cyg	05200726	-34.7	-54.4	1154	0.052	priv(fig) $^{\char93 \char93 }$
	34201475	$-8.74^{\char93 }$	$-14.7^{\char93 }$
	$\underline{52200201}$	$\underline{-11.5}$	$\underline{-16.0}$
	52200719	-8.34	-16.8
	52200720	-5.01	-9.34
	53001311	-5.86	-11.0
	74103105	-34.8	-49.3

* The best spectrum together with its parameters are underlined for each source. They are used to estimate the pump rate.
** The reference codes in Col. (9): NEU99: Neufeld et al. (1999); SYL97: Sylvester et al. (1997).
# Only the sub-line No. 10 of 34201475 spectrum are used.
## (fig) means the integrated 1612 MHz OH maser fluxes are measured by us from the figure in the literature.

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations and data processing
	3 The 34.6 ${\mu }$ m absorption line
	4 The 1612 MHz OH maser pumping
	5 Summary
	References