The concealable left panel in Timeline window is called Y-axis label panel which contains a tree-like representation for Y-axis label for the timelines. For a SLOG-2 file convertible from CLOG or RLOG with the default viewmap, the typical Y axis label panel looks like that is shown in Figure 3.20. Together with toolbar's label buttons, e.g. LabelMark and LabelMove, and standard mouse selection methods listed in Table 3.10, labels can be rearranged easily to create a more easily understood timeline canvas. For multiple viewmaps SLOG-2 file from IBM's UTE trace environment, LabelExpand and LabelCollapse buttons will come in handy to expand and collapse the label tree by one whole level. In order to minimize unnecessary redraw of the timeline canvas, the synchronization between the label panel and the timeline canvas is carried out passively, i.e. user needs to press the CanvasReDraw button in the toolbar to update the Timeline window with the changes from the label panel.
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