Oh your response is so inspiring! I didn't realize before that I wasn't logging data in my monitor. Once I changed the plane from z=0 to z=0.5 I was able to successfully overlap the monitor data with the Gaussian beam. Thank you so much for your help.
I still have a question about this. I'm still wondering why could I overlap the monitor data with gaussian beam but could not using the "z2" monitor inside the analysis group, even if they are exactly the same plane. Â
 
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