This is inRangeDeltaMin, the lowest in-range-error delta recorded across the sub-samples for this interface's current window. A nonzero floor here means the error condition never fully stopped during the window, marking it as a continuous defect rather than an occasional event on this specific link. For example, a min of 0 next to a max of 500 shows the errors are intermittent, while a min of 12 would show they never stop.