Fig. 4

Estimation of the signal transfer speed by repeated median regression. A–J Repeated median regression of the distance of chloroplasts from the blue microbeam, against the start time of chloroplast movement estimated by the without-model approach, in cell 1–cell 9 and all cells. The signal transfer speed was defined as the slope of the regression lines. Dots, solid lines, and shaded regions are the observed values, regression lines, and 95% confidence intervals, respectively. K List of the estimated signal transfer speed. L Boxplot of the estimated signal transfer speed in cell 1–cell 9. A box represents quartiles, a centre line the median, and whiskers extend to the highest and lowest values within 1.5 × interquartile range