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Gets an instance of IInterior which represents the background color of this conditional format.
Use the returned IInterior object to access or modify the fill settings applied when the above-average conditional formatting rule is in effect.
IInterior Interior { get; }
ReadOnly Property Interior As IInterior
worksheet.Range["A1:A5"].Value = new object[,] {{10}, {20}, {30}, {40}, {50}};
IAboveAverage format = worksheet.Range["A1:A5"].FormatConditions.AddAboveAverage();
IInterior interior = format.Interior;
interior.Color = Color.Yellow;