Teledyne LabMaster 10 Zi Series Operator's Manual page 128

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Color Persistence - The button behaves the same way as Analog.
However, the grid display shows a color waveform where red
indicates most frequent occurrences while blue denotes the less
frequent.
Instead of using the knob, you can provide values for Intensity (same
control on Display and Persistence dialogs) or Saturation controls.
LM10Zi-GSM-E Rev A
Getting Started Guide
121