Not many datasets can be plotted as surface chart, which look like topographic maps.
Because you use a surface chart to represent a 3-D surface on a 2-D piece of paper, it is par-
ticularly important that your surface be generally sloping toward the front of the chart.
Otherwise, you will never see the details hidden by the hill at the front of the chart.
Before you start to build a dataset, you should look at Figure 5.47. The data for the chart is
in C3:L12. Each data point requires two headings. Headings for the front axis are in C2:L2.
Headings for the side axis are in ...
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