SaasTropModel Humidity Confusion

[sailvssea]

]The setWeather function in SaasTropModel tried to transform relative humidity into actual water vapor pressure and set the value to "humid" value. [LINE 371]
However, in the wet_zenith_delay function, the computation of pwv tried to use "humid" value, which did not actually represent the relative humidity.
This is confused me about the calculation of ZWD in the saastamoinen model.