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a picture of the sky. As you can see, the legend turns into labels on the z-axis.
But overall, though it is visually more appealing, it is more difficult to see the
point you are trying to make with the data.
Other ways of visualizing the same data series are represented by the stacked area
chart or the percentage stacked area chart.
Figure 88: Stacked and percentage stacked area charts
The first does what it says: each number of each series is added to the others so that
it shows an overall volume but not a comparison of the data. The percentage stacked
chart shows each value in the series as a part of the whole. For example in June all
three values are added together and that number represents 100%. The individual
values are a percentage of that. Many charts have varieties which have this option.
Line charts
A line chart is a time series with a progression. It is ideal for raw data, and useful for
charts with plentiful data that show trends or changes over time where you want to
emphasize continuity. On line charts, the x-axis is ideal to represent time series data.
Figure 89: Line charts
Scatter or XY charts
Scatter charts are great for visualizing data that you have not had time to analyze,
and they may be the best for data when you have a constant value against which to
Chapter 3 Creating Charts and Graphs 93
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