Unfortunately I cannot share it now, as it’s a work in process and it’s rights don’t belong to me. However, I can address another work on CO-OFDM in which you can find graphs more or less like the ones I talked about. It’s a Master’s Thesis from University of Denver named “HIGH DATA RATE COHERENT OPTICAL OFDM SYSTEM FOR LONG-HAULTRANSMISSION”. I’m sure it will help you.