A line chart layer contains an object theme that displays information as a series of data points connected by line segments. Like bar and pie charts, this enables you to examine more than one variable per record at a time. To ensure the order of categories in this type of chart, use an ORDER BY clause in the query that defines the underlying table.
Line charts are composed of a chart with horizontal and vertical axes that represent the range of data values. The line connects the data points at the appropriate locations along the axes. A grid pattern is provided to aid in visualization.