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The following diagram identifies the major aspects of the file format representation of a chart.
Figure 1: High-level structure of a chart
The chart sheet specifies a chart, a graphic that displays data or the relationships between sets of data in a visual form, and a data sheet, a set of data for the chart. The chart specifies one or two axis groups, a set of axes against which the chart data is plotted, and the set of series, trendlines, and error bars specified in the chart. Each axis group specifies one to four chart groups that specify the type of visualization used to display the data. Each series, trendline, and error bar specifies a chart group with which it is associated.