VC ChartWizard改变图表类型

Question

 Chart.ChartWizard(var,                    // Source.
    COleVariant((short)4),  // Gallery 4
                    covOptional,             // Format, use default.
                    COleVariant((short)2),   // PlotBy xlColumns.
                    COleVariant((short)0),   // CategoryLabels.
                    COleVariant((short)1),   // SeriesLabels.
                    COleVariant((short)TRUE),  // HasLegend.
                    COleVariant("随时间变化曲线"),  // Title.
                    COleVariant("时间轴"),    // CategoryTitle.
                    COleVariant("数值"),  // ValueTitles.
                    covOptional              // ExtraTitle.
                        );
我想画折线图，画出来的图有数据标记，使线很粗，我想去掉数据标记，在程序中该怎么该，谢谢！