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One of my main problems with Numbers is the fact that it has much less of the functionality of Excel. That's why I barely use Numbers.

One of the main things that I always thought impossible was plotting two axes on one graph. This is my main reason for my dislike of Numbers.

Now that many other interesting questions that I didn't think had answers are getting answered, I thought I might ask this question:

How can I plot two lines on one graph using a secondary axis in Numbers?

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I think the accepted answer for this should now be changed as this is now possible. – Nick Hawes Jun 28 '14 at 9:34

If you want a line graph with 2 y-axes. You to insert->Chart-> 2-Axis. Put in your data. One of the sets will be a line the others a bar. The way to fix that is: Select the one that is a bar then to go to the Inspector-> Chart-> Series. It will say series type-> select that and change it from bar to line. Right below that it says plot on: There you can determine if you want that line to be plotted on y(1) or y(2).

What it looks like at first for 2-axis

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"2D 2-Axis" is the chart type in Numbers 3.2. – Nick Hawes Jun 28 '14 at 9:33
Yes, a welcome improvement in Number 3 from Numbers 2! – Ian C. Jun 28 '14 at 16:42

Was able to do the same thing in Numbers 2009 (v2.1), but had to fiddle a lot. Use the 2-axis format. The program resists you all the way.

Here is a 2-axis graph (climate diagram) created using Numbers 2.1:

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Could you perhaps expand your answer with specific instructions as to how the graph in the screenshot was created? – grgarside May 14 '15 at 19:26

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