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For a parameter "Gate position" with type "instantanious" it could be that the only valid values are 0 or 1, meaning closed and open. Calculating a sum or a mean will not make sense because it can result in invalid data above 1 or between 0 and 1.
Available time steps
Since 2018.01, the time steps available in the time series resampling dialog can be customized through the FEWS configuration. More information can be found in the configuration guide for the TimeSeriesDisplayConfig.xml.