def data_download(self, files):
        """Create the rst string to download supplementary data"""
        if len(files) > 1:
            return self.DATA_DOWNLOAD % (
                ('\n\n' + ' '*8) + ('\n' + ' '*8).join(
                    '* :download:`%s`' % f for f in files))
        return self.DATA_DOWNLOAD % ':download:`%s`' % files[0]
Create the rst string to download supplementary data