Why the cube files include negative values?

[Zhendong Guo]

Dear Everyone
   I check the output .cube files and find that negative values are 
included.
As we know that the cube files show the distribution of electron density 
but the electron density should be positive. So I feel very puzzled. Could 
you kindly give me some explanation ?

P.S. I guess one possible reason is that the data in the cube files is for 
the wavefunction not for the electron density.
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