= Horizontally integrated plume concentration
{title2=$c(z,t)=\int C(x,z,t)\,dx$}
The horizontally integrated plume concentration is the <integral> of a local <concentration> $C$ across the plume. It measures scalar amount per unit vertical length and unit span, and its vertical <integral> is total scalar amount per unit span. Unlike a local <concentration>, its dimensions include one horizontal length. It must be distinguished from <horizontally averaged plume concentration> when a plume's width varies with height.
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