var presentation = PresentationDocument.Load("Chart.pptx");
var chart = ((GraphicFrame)presentation.Slides[0].Content.Drawings[0]).Chart;
chart.Frame.Layout.Width = Length.From(450.0, LengthUnit.Point);
chart.Frame.Layout.Height = Length.From(200.0, LengthUnit.Point);
presentation.Save("Resized Chart.pptx");
var
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