Adjusting the Axes
The x-axis and y-axis of your graph determine the range of values that are visible. You can adjust their scale to best display your data.
When there is not enough room to label all of the tick marks, labels are evenly spaced, and are skipped in multiples of two, five, or ten. (For log scales, tick marks are labeled in powers of ten.)
If you already have some data and you want to automatically adjust the axes to it:
Click the Scale to Fit toolbar button, or choose Scale to Fit Data from the View menu.
There are several ways to make an axis show a different range of values:
Click a tick label (the number) near the end of the axis, and drag it toward the edge or toward the middle. The ticks get closer together or farther apart. You may need to do this more than once to get the range you want.
Double-click the tick label on the edge of a graph, and type the number you want. Note that editing a tick label that’s not on the very edge of the graph just changes that label; it doesn’t change the axis range.
To move the axes without changing their scale, click and drag either axis.
You can control the location and visibility of axes, tick marks, and labels with the Axes inspector.