Camera distance (m) to the nearest culled tile — the one most likely to be wrongly culled while on screen. Infinity when nothing was culled.
Which frustum plane (0..5: L,R,B,T,N,F) rejected that nearest culled tile, or −1. With its signed distance + radius this says whether a cull is borderline (signed ≈ −radius → edge tile) or bogus (signed ≪ −radius, or radius ≈ 0 → bad bounding volume).
Rendered tiles this frame whose footprint was drawn at a FINER LOD the previous frame — i.e. the region's LOD regressed to a coarser ancestor (the visible pop).
Worst single regression this frame, in LOD levels (prevDepth − drawnDepth).
The depth the worst regression dropped FROM (deepest descendant last frame) and TO.
Tiles frustum-culled this frame.