Seasonal variation in the rate of HHW generation. Note: box slashes of the
HHW generation rate for the four seasons. Boxes indicate the inter-quartile range
(25th percentile–75th percentile); lines within boxes indicate medians; quadrates
within boxes indicate means; whiskers below boxes represent frequency distribution
values of 97.5% CI; whiskers above boxes represent frequency distribution
values of 2.5% CI.