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The time series modifier is a modifier which allows the forecaster to edit a timeseries by selecting points in a graph or by
changing values in a modifier. In most applications of this modifier the forecaster is directly editing a time series which is used
by the models. For example it might be used to directly edit the precipitation. This is contrary to how for example the single value modifier
WECHNG is used. This modifier edits an empty time series which is than read by the snow17-model which modifies its state based on the input from
this modifier. A time series modifier always has a start- and enddate. Optionally (if configured) a valid time is available.

When using a valid time in combination with a simulated forecast timeseries, the modifier is applied from the valid time to T0.
When using a valid time in combination with a external forecast timeseries, the modifier is applied when the valid time is later than the external forecast time.

The forecaster can edit this time series by making changes in table or in the graph. The changes in the graph are made by clicking in the graph.
When the user clicks from left to right then the values between the points are interpolated.
When the user clicks from right to left only the newly added or changed points are adjusted but no interpolation will be done between
the last two points. When more than one time series is shown in the display it is possible to make a selection of which time series should edited when making changes by clicking in the graph.
The time series which should be changed can be selected by clicking on the legend of that example time series in the graph

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