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These series will be created with a formula that contains variables refering to time series.
The user can pick a name, a parameter group (this
-Name => Just to show extra information in the GUI for clearification
-Parameter group => This will decide in which plot the series will be added) and a formula. Behind the screen it will use the first parameter id of the parameter group, this is done so it is able to listen to <parameterDisplayOptions> from TimeSeriesDisplayConfig.xml to determine its lineStyle for instance.
-Formula => This formula will be used to calculate the values of the expression series based on the series it is referring to.
This series will be added and appear with the Name of the series as location and the formula as postfix.
The expression series will always be non-equidistant with only the time steps that are present in all the source series.
When the selection has changed and the time series from the formula variables (sources) are not present anymore, they will be added as invisible so it can still be seen where the on the fly expression series is based on.
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