Template:Graph:Chart/doc

Examples
Line Chart:

Note: The y-axis starts from the smallest y value, though this can be overridden with the  parameter.

Area chart:

Note: The y-axis starts from zero

Bar chart:

Line chart with more than one data series, using colors:

Area chart with more than one data series showing blended overlap:

Bar chart with multiple data series:

Area chart with smoothed data values:

Bar chart with stacked data series:

Note that the order of the stacking is governed by the alphabetic value of the y-Titles used for the legend. You can always prepend a number 1, 2, 3 to establish whatever stacking order you want.