// couldn't get the label above to appear in front, so using an    
        // annotation instead...    
        CategoryTextAnnotation a = new CategoryTextAnnotation("Minimum grade to pass", "Robert", 0.71);   
        a.setCategoryAnchor(CategoryAnchor.START);   
        a.setFont(new Font("SansSerif", Font.PLAIN, 12));   
        a.setTextAnchor(TextAnchor.BOTTOM_LEFT);   
        plot.addAnnotation(a);