ODB functions
===============
This is the list of all the functions related to :class:`Odb` data.

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    * - :func:`append`
      - Append the given data to file

    * - :func:`file`
      - Return a file handler for the specified filename

    * - :func:`odb_filter`
      - Filter :class:`Odb` data

    * - :func:`odb_visualiser`
      - Define visualisation for :class:`Odb` data

    * - :func:`read`
      - Read the given file and returns a variable of the appropriate type

    * - :func:`retrieve`
      - Retrieve data from MARS

    * - :func:`write`
      - Writes/appends the given data to file