Figure 9.

Detailed average expression and variance across months for sadness. The 24-h pattern is repeated to form a 48-h pattern and ease readability. (a–c) weekdays expressions, and (g–i) weekends expression in the 24-h clock. (d–f) weekdays expressions, and (j–l) weekends expressions by the hours passed since sunrise. Each group shows, from top to bottom, the heatmap repeated in a 48-h interval to ease readability of the patterns, the mean expression levels with bars indicating the standard deviation, and the variance across months per each hour of the day.