Like you, I saw Éric F5JKK graphs for the first time when he posted them some few weeks or months ago. I didn’t record that page URL, but I’m going to do it now. I don’t know if I’ll get to check it, but I’ll try. I admit that, despite I know there is so much info about everything on so many good sites on the internet, I am a bit old fashioned and keep working on the bands the old style and also following my own smell sense or instinct built after nearly 40 years in the hobby.
I’ll try to have a go in that web site to learn what it can offer and how to use it.