Formatting the Value Range Title 
Use
Every value range can have a minimum, optimum and maximum value. You can format the titles for these values individually.
Prerequisites
You already added a value range and defined titles for the values. See
Adding Value Ranges.Procedure
This brings you to the dialog box with the same name.

You can change the titles of all the values of the current value range with tabstrip Value Range. However, all formatting selected in the other tabstrips only refer to the title you selected before calling the dialog box.
Changing the Filling and Border
Changing Font Properties
Changing the Alignment