Embodiments of the invention provide apparatuses and methods for providing a graphical user interface on the display device, where the graphical user interface includes a graph viewing tool for charting data. The graph viewing tool includes: (a) a first display area displaying a first axis and a second axis of a graph, the first axis representing a first parameter of the data over a first range of values; (b) a second display area displaying a third axis representing the first parameter over a second range of values; and (c) a first tool and a second tool displayed in the second display area proximate the third axis, wherein the first tool and the second tool are configured such that they can be moved relative to each other and relative to the third axis to increase or decrease the first range of values displayed along the first axis in the first display area.