It can now be clearly
discerned that during the sampling period 0900–1000 EDT,
just before the pollen concentration reaches a minimum, the
‘‘extreme’’ event duration fraction peaks (D = 0.13 at 0930 EDT)
and then decreases to aminimum (D = 0.06 at 1000 EDT) during
the same sampling period that pollen concentrations are
minimal. Subsequently, the duration fraction rises sharply
again to a value of D = 0.13 at 1015 EDT.