Changing the scale of a graph allows you to zoom in on the graph’s features. Let’s use the Hubble Diagram graph from the previous page as an example.
![](https://dev.voyages.sdss.org/wp-content/uploads/2018/01/format10.gif)
You can zoom in on the graph by resetting the scale on the y-axis. Double-click on the y-axis and a Format Axis box will appear as shown below:
![](https://dev.voyages.sdss.org/wp-content/uploads/2018/01/format11.jpg)
Click on the scale button. Try changing the y-axis scale to range from 13 to 25.
![](https://dev.voyages.sdss.org/wp-content/uploads/2018/01/format12.jpg)
Click OK, and your modified graph will appear.
![](https://dev.voyages.sdss.org/wp-content/uploads/2018/01/format13.gif)
Double-clicking on the x-axis will allow you to modify the x-axis in a similar manner.