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Returns a pi timeseries xml or json file containing the timeseries data filtered by a plotId of the DisplayGroups.xml configuration. See also http://fews.wldelft.nl/schemas/version1.0/displayGroups.xsd.
The TimeSeriesSets configured for a plotId will be used to filter the timeSeries. The line, area and bar elements are used when determining the relevant TimeSeriesSets.
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