Mouse: click to select, click again to clear
    Keys:  <Tab>/<Back Tab> to focus, arrows to choose, space to select

    Mouse: click on legend entry to hide/show line segment
	   click on y-axis to toggle linear/log scale
	   right-click on y-axis to hide/show all line segments on that axis
	   hover on points on graph to show coordinates
	   middle-click on points on graph to exclude from further analysis
	   click-move-click on graph instead of click-drag-release to zoom
	   right-click on graph unzoom