You want to avoid misrepresenting your data or causing readers to draw incorrect conclusions. If the data in the chart is more precise with unsmoothed lines, then you should probably not smooth them. Make sure you give some thought to what conclusions people may draw from your data. One final note: Just because Excel provides a way for you to smooth the lines connecting data points, that doesn't always mean that you should. Select the Smoothed Line check box, which is at the very bottom of the options.The Line options of the Format Data Series task pane. Click Line to make sure the line options are visible.Click the Fill and Line icon (it looks like a spilling paint can).Excel displays the Format Data Series task pane at the right side of the screen. Choose Format Data Series from the Context menu.The steps are slightly different in Excel 2013 and later versions:
Multiple items can be plotted by using different colored points or different point. The Line Style options of the Format Data Series dialog box. Scatter charts are used to plot clusters of values using single points. Now, right-click on the chart and go to Select Data. Then from the Insert ribbon, go to Recommended Charts. Click Line Style at the left side of the dialog box. Select the food types and their assigned incremental data points.Excel displays the Format Data Series dialog box.
(This makes sense the lines are meant to connect the points.) You can give your graphs a more professional look by simply smoothing out the curves Excel uses at each data point. When you create line charts in Excel, the lines drawn between data points tend to be very straight.