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Most of the advanced features in the SLOG-2 viewer are provided throughthe Zoomable window. There are two zoomable windows in Jumpshot-4: Timeline and Histogram windows. Figure 3.9 is the initial display of the Timeline window of a half gigabyte 16 timelines slog2 file. Zoomable window consists of several concealable and removable components. In the center of the window, it is the zoomable and scrollable canvas. For Timeline window, the center canvas is called timeline canvas. Directly on top of the zoomable canvas is the time display panel. On top of the display panel, there is the removable toolbar. To the left of the canvas is the concealable Y-axis label panel. To the right of the canvas is the concealable row adjustment panel. At the bottom of the canvas is the time ruler canvas. Both Y-axis label and the row adjustment panels can be put out of sight by clicking the tabs in the dividers or dragging the dividers to the side of the window. The top toolbar can be dragged out of the window or be repositioned in the other 3 sides of the window. A bare minimal zoomable window can be obtained by the removal of toolbar and the hiding of the left and right panels. An almost bare minimal Timeline window looks like the one shown in Figure 2.1.