Outer band edges — central-90% percentiles (the faint variance envelope).
This bucket is a SUSTAINED coast (you stopped pedalling/moving for longer than the bridge window) on an output channel — value/band are NaN here, and the chart draws a drop-to-baseline rather than a line. Brief coasts aren't flagged: they stay real values and just dip the smoothed line.
Inner band edges — the inter-quartile range (the denser typical spread).
Bucket median (the robust line).
One resampled point carrying BOTH axes — distance and elapsed time — so the chart can switch x-axis without recomputing. Buckets are even in distance;
timeSecondsis the elapsed time reached at that distance, so the time axis spans 0 → total elapsed.valueis native units (m, m/s, bpm, W, rpm, °C).