Unsure about LQI / blue line in the network diagram

I am trying to integrate an ESP32-C6 as a router into my new network (the device on top in the diagram below), but the signal quality seems not to be great. Regardless, I looked into the Source Routing options in deCONZ and had the fast neighbor discovery enabled for a bit.

Now I see a straight blue-ish line in the network and the documentation doesn’t seem to explain what this line represents. What does this line mean?

Additionally, I enabled the LQI indicators in the graph, which is helpful, but when I do an internet search for what these numbers mean, all the pages I find only talk about a single number, not a pair. The documentation doesn’t go into detail what the numbers mean, neither which number means what. I assume it’s obvious to more experienced engineers, but I can only guess: it’s up/down? down/up?

This is on Windows 10 with deCONZ v2.33.2, using a ConBee III as the coordinator.

Hello you will found some help here

and

Thank you very much, it didn’t occur to me to check the GitHub wiki.