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In Panels (a) and (b), the distribution in different states of fractional occupancy and mean LT, respectively, is reported in blue for the young subjects and in red for the old subjects. The bottom and top edges of each box indicate the 25th and 75th percentiles. The outliers are represented by the “+” symbol. In each boxplot, the solid line indicates the median, so for example, the median value of the FO for young subjects in S1 is 39%
