I don’t know much about the limeSDR…,
But, limeSDR only have 2 RX channels, not 6.
The thing, that you saw, “RX_L, RX_H, RX_W” is actually same one RX channel.
It just choose which carrier frequency you will get.
RX_L : is lower then 2.5Ghz,
RX_H : higher than 2.5GhZ,
these three thing may because of different rx power, I guess… but not sure.