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+By default, *Collectors* uses a simple python :class:`list` for each series. You can use other storage backends to handle very large amounts of data or to get a simple *MS Excel* export. You can also add your own storage classes very easily.
+Ubuntu’s package for PyTables is somehow broken, so you need to build your own. If *gcc* is already installed, you just need to add the development files for python and HDF5 before you can build and install PyTables from `PyPI <http://pypi.python.org/pypi/tables>`_: