An INTEGER enumeration (cwrCirculate, cwrAverage, cwrSpecific), read-create, choosing which tone within a multi-tone burst is sampled for this timeline, defaulting to averaging all tones. It lets the timeline reflect a single problem tone, a rotating sequence of tones, or an averaged composite, depending on what the engineer is diagnosing. For example, leaving cwrTlToneSelection at its default cwrAverage gives a smoothed timeline suitable for general health tracking, while switching to cwrSpecific would be used to chase one suspected bad tone.