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During a heatwave, not only the air but also the ocean grows warmer -- the temperature is substantially higher than the seasonal mean value for at least five consecutive days.

The highest level of particulate matter exposure recorded during the fire emergency exceeded the historic mean value by more than 14 times, the paper notes.

Just because the median increased, however, doesn’t mean values of all homes rose by the same measure.

In addition to computing the mean energy of the ground state in their set-up, the authors calculate how much the energy varies from this mean value.

The dip from March 2018 doesn’t mean values declined across the board.