How can one create a double horizontal axis for a plot in ggplot2?

Posted by Alex Holcombe on Stack Overflow See other posts from Stack Overflow or by Alex Holcombe
Published on 2010-03-26T08:38:55Z Indexed on 2010/03/26 8:43 UTC
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I need to show the values on the horizontal axis (aka ordinate, aka x-axis) converted into other units. Hence the need for a second axis.

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