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[ferret_users]if else statement on negative values

Hi All:
I am trying to use the "if else" statement to set the lower limit of negative values.
However, the script below is not working. u_ave_1 still has the value below -20. It's supposed to work and had worked before. I don't quite understand why.     
let u_ave_1 = if u_ave[d=1] lt (-20) then (-20) else u_ave[d=1]
Thanks in advance for your help!


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