Boxplots showing the distributions of cosine similarities of neighborhoods of nodes in pairs of daily contact networks, for each class, and restricting the neighborhoods to intra-class (violet) and inter-class (blue) neighborhoods.

<p>These distributions are obtained in the following way: in each class, for each person we calculate the cosine similarities of his/her neighborhood inside the class and outside the class for each pair of days. Each distribution thus corresponds to 21(couples of days)*N(number of students in the class) similarity values. The center of each box gives the median (value given above each box) and its extremities correspond to the 25% and 75% quartiles. The star symbols show the mean value of each distribution.