[Pw_forum] neb

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Hi 
In the output of the neb what is the physical meaning of that the activation energy ->0.0000 and activation energy <-7.8eV is it a range that activation energy lie in between ...
In example 17 at the end of the output neb file ->..=<-...
my question activation energy that we have from the neb must have single value or it will be withen a range of values as  ..< activation energy >..
Best regards 
Ihsan A.Erikat
Jordan Physics department