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    double lightExtinctionCoefficient; ///< "k" parameter (beer lambert) used for calc. of absorbed light on resourceUnit level
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    double lightExtinctionCoefficient; ///< "k" parameter (beer lambert) used for calc. of absorbed light on resourceUnit level
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    double lightExtinctionCoefficientOpacity; ///< "k" for beer lambert used for opacity of single trees
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    double lightExtinctionCoefficientOpacity; ///< "k" for beer lambert used for opacity of single trees
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    // climate
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    // climate
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    double temperatureTau; ///< "tau"-value for delayed temperature calculation acc. to Mäkela 2008
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    double temperatureTau; ///< "tau"-value for delayed temperature calculation acc. to Mäkela 2008
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    // water
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    // water
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    double heatCapacityAir; // Specific heat capacity of air [J  / (kg °C)]
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    double airPressure; // atmospheric pressure (mbar)
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    double airDensity; // density of air [kg / m3]
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    double airDensity; // density of air [kg / m3]
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    double laiThresholdForClosedStands; // for calculation of max-canopy-conductance
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    double boundaryLayerConductance; // 3pg-evapotranspiration
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    // site variables (for now!)
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    // site variables (for now!)
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    double latitude; ///< latitude of project site in radians
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    double latitude; ///< latitude of project site in radians
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    // production
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    // production
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    double epsilon; ///< maximum light use efficency used for the 3PG model
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    double epsilon; ///< maximum light use efficency used for the 3PG model
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};
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};