Apple Pages 2 - Manual (Page 199)

Chapter 9 Creating Charts 199
The colored squares next to the row labels (Region 1 and Region 2) show which color
represents each data series in the chart.
The illustration below shows how this data looks as a column chart.
In this chart, the data series are represented by rows in the Chart Data Editor. The data
points are represented as a series of dark-colored bars and a series of light-colored
bars.
Most charts have three-dimensional (3D) versions. Here’s what the 3D column chart
looks like for the data series above.
These squares indicate
which color represents
each data series.
The data sets contain
one data point (one bar)
from each of the data
series.
These four bars represent
one data series.
The chart legend denotes
the two data series.