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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.