CST - post processing questions(E-field integration)

Hi everyone, I have a question about a template based post-processing called " Evaluate field in arbitrary coordinates ",

 I want to use this function to get a 2D E-field integral of a specific plane, my setting is shown below.   

 

 

 

 

 

 

 

 

 

 

The question is , although I can get the integral result, I don't know if this value is phase-related?

 Because at the 2D result of my E-field monitor, I can see that the E field changes with the phase, as shown below.
 

But what I get from the 2D integral is a fixed value, and I can't find a place to adjust phase, so I really don't know the physical meaning of the 2D integral. 
Thank you!!  

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