In a long-term weekly grab sampling strategy, a single grab
sample was taken e.g. every Monday, for a certain number of
weeks. In that case, the average of these samples is an estimate
of the emission. This was mimicked as follows. For each
Monday in the original dataset, a data point between 9 a.m.
and 5 p.m. was randomly picked. This was done for each
working day. Since not all days of the week are equally represented
in the original dataset, not all simulated sampling
strategies had the same length: the lengths varied between 31