stem plots vertical lines from a baseline to the y-coordinate and
places a marker at the tip.
The position of the baseline can be adapted using bottom.
The parameters linefmt, markerfmt, and basefmt control basic format
properties of the plot. However, in contrast to
plot not all
properties are configurable via keyword arguments. For more advanced
control adapt the line objects returned by
The use of the following functions, methods, classes and modules is shown in this example: