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Gets the ISparkHorizontalAxis object for this ISparkAxes object.
Use the returned object to access and modify the horizontal axis settings of the sparkline group.
ISparkHorizontalAxis Horizontal { get; }
ReadOnly Property Horizontal As ISparkHorizontalAxis
worksheet.Range["A1:A4"].Value = new object[,] {{2}, {5}, {3}, {7}};
ISparklineGroup group = worksheet.Range["B1"].SparklineGroups.Add(SparkType.Line, "A1:A4");
ISparkHorizontalAxis horizontalAxis = group.Axes.Horizontal;
horizontalAxis.RightToLeftPlotOrder = true;