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Representative examples of the velocity variance (σ) calculated during coarse graining (□) along with an exponential fit (solid line) for the M1 cells (a) and for the M4 cells (b). As shown by the paired values, the M4 cells show a shorter characteristic time scale than the M1 cells (c; d). Lines in (c) pair experiments performed on the same day and the error bar in (d) indicates the 95% confidence interval.
