Database Reference
In-Depth Information
Figure 7-7. A simple timeline of the number of annual earthquakes
Right-click on the y-axis, select Add Reference Line, and add an average line by filling out
the resulting dialog box. Then right-click on the y-axis, select Add Reference Line again, and
this time add a distribution of +3 and −3 times the standard deviation, with dotted red lines
and no fill. Both reference line dialog boxes are shown in
Figure 7-8
.
