I want to measure the reflection coefficient.
I have the following circuit:
[![enter image description here][1]][1]


With this measurements I get the following graphs:

[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/z492q.png
  [2]: https://i.sstatic.net/BL4Sh.png


Is the reflection coefficient the negative peak of the RED signal divided by the positive peak of the RED signal? or the positive peak of GREEN divided by positive peak of RED.

Help would be appreciated ! thanks!

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by the way I'm measuring that way because I have an upcoming lab in which I have to measure this way.