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Negative (Precipitable Water) values

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I am trying to compute the precipitation water throughout but I obtain negative values... Anyone knows how can I fix this problem?
I am doing it like that:,, ds.QVAPOR,(ds.PH+ds.PHB)/9.8)

Is it correct?

Thank you so much!
We usually use NCL to obtain derived variables like pw. And the values are reasonable. Unfortunately we are not familiar with the method you used. Hope someone in the community may have an answer to your question.