Plots can be enlarged either by resizing the window or zooming. In some plots zooming is achieved by holding down the control key and right mouse button and dragging out a rectangle. Rectangles that are too small are ignored and a warning bell will sound. The content of the window is magnified such that the contents of the zoom box fill the window. The Zoom out button will restore the plot to the previous magnification. In other plots, x and y scale boxes achieve similar effects.