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#### 12.7.2 Header and sectioning structure

By default, the first three outline levels become headlines, defining a general document structure. Additional levels are exported as `itemize` or `enumerate` lists. The transition can also occur at a different level (see Export settings).

By default, the LaTeX output uses the class `article`.

You can change this globally by setting a different value for `org-latex-default-class` or locally by adding an option like `#+LATEX_CLASS: myclass` in your file, or with a `EXPORT_LATEX_CLASS` property that applies when exporting a region containing only this (sub)tree. The class must be listed in `org-latex-classes`. This variable defines a header template for each class143, and allows you to define the sectioning structure for each class. You can also define your own classes there.

The `LATEX_CLASS_OPTIONS` keyword or `EXPORT_LATEX_CLASS_OPTIONS` property can specify the options for the `\documentclass` macro. These options have to be provided, as expected by LaTeX, within square brackets.

You can also use the `LATEX_HEADER` and `LATEX_HEADER_EXTRA` 144 keywords in order to add lines to the header. See the docstring of `org-latex-classes` for more information.

An example is shown below.

    #+LATEX_CLASS: article
    #+LATEX_CLASS_OPTIONS: [a4paper]
    #+LATEX_HEADER: \usepackage{xyz}

    * Headline 1
      some text

#### Footnotes

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Into which the values of `org-latex-default-packages-alist` and `org-latex-packages-alist` are spliced.

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Unlike `LATEX_HEADER`, contents from `LATEX_HEADER_EXTRA` keywords will not be loaded when previewing LaTeX snippets (see Previewing LaTeX fragments).