You use dualaxis graph to plot dualaxis columnandpolyline charts or dualaxis polyline charts. Below is the plotting algorithm for a dualaxis columnandpolyline chart:

A 
1 
=canvas() 
2 
=demo.query("select * from STATES where STATEID<6") 
3 
=A2.new(ABBR,"Population":Type,POPULATION/1000000:Value) 
4 
=A2.new(ABBR,"Area":Type,AREA/1000:Value) 
5 
=A3A4 
6 
=A1.plot("Graph2Axis","categories":A5.(ABBR+","+Type),"values": A5.(Value),"drawShade":false,"lineThick":2,"yTitle":"Population(M);Area(K sq. mi)","yTitleAngle":90,"axisRightColor":3355444) 
7 
=A1.draw@p(500,250) 
A5 concatenates records of population and those of areas to generate data for chart plotting:
Data property setting for a dualaxis columnandpolyline chart is similar to that for a column chart with both category and series:
During setting the properties, titles are added for the two vertical axes with units designated. In this case a semicolon is used to separate them:
A6 removes shading effect for the polyline and increases the line thickness. Now here’s A7’s plotting result:
The data for chart plotting in the above algorithm includes only two series of data: population and area of each state. Plot the first data series as columns with the left vertical axis and plot the second data series as a polyline with the right vertical axis. If there are more than two series of data, plot them as columns and lines evenly.
Modify Type property of the dualaxis graph to 2Axis2Line:
Then a dualaxis polyline chart will be plotted, in which the first data series will be plotted as a polyline with the left vertical axis. The plotting result is: