RF frequency domain scattering electric field module- normalization of scattered field Ex by the background field Ebx

I am uncertain if I am incorrect in my assumption, so I have come here hoping someone can clarify for me.

emw.Ex -displays the scattered electric field
emw.Ebx -is initial background electric field used for solving the problem
I want to normalize (emw.Ex/emw.Ebx) to see the enhancement. I am plotting on a cross section where emw.Ebx is almost a constant value at this height (~0.26 V/m).

When I plot (emw.Ex/emw.Ebx) vs when I plot (emw.Ex/0.26) where 0.26 is the value of emw.Ebx at this cross section, I get two different plots.

Is (emw.Ex/emw.Ebx) the proper way to plot this enhancement?

Maybe I am interpreting emw.Ex or emw.Ebx incorrectly.

Thank you,

Brandon