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Significance for CLDTOT field in AMWG Diagnostics Package?

Hi there,I am using the (very nice) AMWG Diagnostics Tool to analyze some F simulations I am doing, where I progressively remove Greenland topography. I have a question about the significance test for CLDTOT in particular: I get 'significant' total cloud cover changes uniformly, globally, for very small changes to Greenland topography.  I would not expect this, and am wondering if there is an issue with how significance is calculated (perhaps for fields with units of fractions??).  Should I take the significance plot seriously, in this case? Example plot attached -  Thanks for any help!
 
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