Difference/Spread Between Two Line Graphs when Data does not Align.

[emoandy05]

Hello!

I have a set of data similar to the following plotted as two line graphs, one for Bills, one for Coups. As any point between the two lines, I would like to find the difference. The problem is, the data points do not line up, so I can't simply take Coups minus Bills. Is there a way to extrapolate the differences based on the line?

Thank you!


[TABLE="width: 345"]
<colgroup><col><col span="2"></colgroup><tbody>[TR]
[TD]Maturity
[/TD]
[TD]Bills
[/TD]
[TD]Coups[/TD]
[/TR]
[TR]
[TD="align: right"]2/4/2016[/TD]
[TD="align: right"]0.1521[/TD]
[TD]
[/TD]
[/TR]
[TR]
[TD="align: right"]2/5/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/6/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/7/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/8/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/9/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/10/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/11/2016[/TD]
[TD="align: right"]0.1983[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/12/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/13/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/14/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/15/2016[/TD]
[TD] [/TD]
[TD="align: right"]0.0156[/TD]
[/TR]
[TR]
[TD="align: right"]2/16/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/17/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/18/2016[/TD]
[TD="align: right"]0.2135[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/19/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/20/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/21/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/22/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/23/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/24/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/25/2016[/TD]
[TD="align: right"]0.1932[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/26/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/27/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/28/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]2/29/2016[/TD]
[TD] [/TD]
[TD="align: right"]0.1951[/TD]
[/TR]
[TR]
[TD="align: right"]3/1/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/2/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/3/2016[/TD]
[TD="align: right"]0.2746[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/4/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/5/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/6/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/7/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/8/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/9/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/10/2016[/TD]
[TD="align: right"]0.1678[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/11/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/12/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/13/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/14/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/15/2016[/TD]
[TD] [/TD]
[TD="align: right"]0.2705[/TD]
[/TR]
[TR]
[TD="align: right"]3/16/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/17/2016[/TD]
[TD="align: right"]0.2237[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD="align: right"]3/18/2016[/TD]
[TD] [/TD]
[TD] [/TD]
[/TR]
</tbody>[/TABLE]

I

 

[emoandy05]

I've added trend lines for Coups and Bills, based on Moving Average. Is there a way to find the difference between trend lines?