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### 4.2.1 Using the JpGraph library to send back images

To get access to the JpGraph library you will need to include at least two files, the base library and one or more of the plot extensions. So for example to create a basic line plot the top of your PHP file must have the lines:

`
include ( 'jpgraph.php');
include ('jpgraph_line.php' );
...
// Code that uses the jpgraph library
...`

Note: You might also use the PHP directive require. The difference is subtle in that include will only include the code if the include statement is actually executed. While require() will always be replaced by the file specified. See PHP documentation for further explanation. For most practical purposes they are identical.

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