... Perhaps the most important thing to note in this context is that SM has a command line editor, which allows you to recall previously typed commands (use the up arrow to scroll back through them) and either them, or edit them. ... identification plots an identification line at the top of the graph, giving the date and some other information, of your choice. label allows you to plot a label on the graph, at the current location. ... You can change the size of the plot window with the location command....