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# How to add two vertical lines to plot and color between them?

Asked by Patrick on 4 May 2013

Hi,

I want to highlight a period in my plot by adding two vertical lines and coloring between them. Any ideas on how to do that?

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Answer by the cyclist on 4 May 2013

Here's one way:

```figure
```
```%Plot something
plot(1:10)
```
```% Add lines
h1 = line([2 2],[1 10]);
h2 = line([5 5],[1 10]);
```
```% Set properties of lines
set([h1 h2],'Color','k','LineWidth',2)
```
```% Add a patch
patch([2 5 5 2],[1 1 10 10],'r')
```
```% The order of the "children" of the plot determines which one appears on top.
% I need to flip it here.
set(gca,'children',flipud(get(gca,'children')))
```

Patrick on 5 May 2013

Perfect!

Patrick on 5 May 2013

Just one more question: instead of using the color 'r' (red), how can I use a light gray color? In fact my graph has three different patches, so I wanted to use different shades of gray...

Cheers!

the cyclist on 5 May 2013

You can encode an RGB value, by replacing 'r' with an RGB vector with values between 0 and 1.

```gray = [0.4 0.4 0.4];
patch([2 5 5 2],[1 1 10 10],gray)
```