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Next, compute the minimum of the field in the subarea using the minval() macro function:

pmin=minvalminvalue(p)

Finally, build the lists for the values (scaling Pa units stored in the GRIB to hPa units):

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• next, compute the maximum of the pressure (with the maxval maxvalue() function)  in the loop and store its values in another list. Build an input visualiser out of it (e.g. call it vis_max). Add a Graph Plotting for it (e.g. call it graph_max) using a different colour. In the end you need to return a longer list like this:

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