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Photodiode measures of inter-pulse delay for a set of Duet electrodes fired in synchronous mode. Early in the life of the electrodes, firing was nearly simultaneous and the majority of paired pulses were separated by a delay of ≤2 μs (dashed line). As the electrodes aged, the inter-pulse delay increased, such that during the last 1400 paired pulses only ~27% were simultaneous (≤2 μs). Solid line tracks mean values for inter-pulse delay at 100 shot intervals.
