Boxplots for the distributions of cumulative contact durations between individuals belonging to given role pairs (horizontal axis), given the occurrence of a contact.

<p>Here we only consider non-zero values of , and contact durations are expressed in seconds and are normalized to a 24-hour interval. On normalizing, the experimental resolution of 20 seconds yields the lowest value of 2.5 seconds visible in the figure. As usual, the bottom and top of the boxes correspond to the 25<sup>th</sup> and 75<sup>th</sup> percentiles, and the horizontal segment indicates the median. The ends of the whiskers correspond to the 5<sup>th</sup> and 95<sup>th</sup> percentiles. The dots are outliers located outside the 90% confidence interval, i.e., events falling below the 5<sup>th</sup> percentile or above the 95<sup>th</sup> percentile.</p>