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 (section 22.214.171.124) specifies a chart (section 126.96.36.199), a graphic that displays data or the relationships between sets of data in a visual form, and a chart data cache (section 188.8.131.52), a local copy of the data that is used if the chart data is missing or if links to external data sources are broken. The chart specifies one or two axis groups (section 184.108.40.206), a set of axes (section 220.127.116.11) the chart data is plotted against, and the set of series (section 18.104.22.168), trendlines (section 22.214.171.124), and error bars (section 126.96.36.199) specified in the chart. Each axis groups specifies one to four chart groups (section 188.8.131.52) that specify the type of visualization used to display the data. Each series, trendline, and error bar specifies a chart group it is associated with.