This technical chart indicates the quality of the Timing Model tracking for each node on the chosen display set.

Good tracking lies in the range -1.0 to 0.4 on the Y axis. The Y axis is logarithmic, the value being the logarithm of the mean timing error in metres. Therefore values around -1 indicate errors around 0.1m and values around 0 indicate errors around 1 metre.

Spikes and tracks outside the normal band indicate potentially poor tracking. Short excursions are not a problem and regularly arise from measurement errors; interference and sometimes other environmental effect.

Traces that lie outside the inner third for an extended period of time indicate failure to track correctly.

This chart is generally useful in a subjective sense as an indicator of overall system tracking quality. It can occasionally highlight specific problems with a particular device.