esaProbeHistoryAvgOnewayR2PDelay is an unsigned 32-bit value that reports the average one-way delay, in microseconds, from the reflector back to the probe, for a completed interval that has already closed and been archived into the rolling history log. Because this figure isolates delay from the reflector back to the probe only, it lets a technician tell whether a latency problem is one-sided rather than assuming the whole round trip is equally at fault. For example, graphing this average one-way delay from the reflector back to the probe across several archived bins can reveal a slow, week-over-week degradation trend that no single live reading would ever show.