.AixLib.BoundaryConditions.WeatherData.Old.WeatherTRY.Weather.RadOnTiltedSurface .AixLib.BoundaryConditions.WeatherData.Old.WeatherTRY.Weather.RadOnTiltedSurfacemodel RadOnTiltedSurface = AixLib.BoundaryConditions.WeatherData.Old.WeatherTRY.RadiationOnTiltedSurface.RadOnTiltedSurf_Liu;