164 ChArting And MultiMediA Figure 3.23 Columns with a red/ white linear gradient. As you have probably realized there are endless possibilities to customize the way charts appear. In this section we have tried to give you an overview of how personalization is done. other chart components Besides Flex built-in components, there are collections of pro- fessional chart components created by third-party companies. Here we present quite an extensive list. Axiis Axiis is an open-source framework for data visualization. You download a package, import the library (SWC file) in your project, and you are ready to use it. There are tons of customization pos- sibilities but the resulting code will be clear and concise. Since it is open source you can check what is under the hood and change it as you like. Go to http://www.axiis.org/ for more information.