where to find the meaning of the iteam in table_fields?

When I saw the slow log with anemometer, I confued about the item meaning list in the table.

All these items defined in the configure file, such as:
'table_fields' => array('date', 'index_ratio','query_time_avg','rows_sent_avg','ts_cnt','Query_time_sum','Lock_time_sum','Rows_sent_sum','Rows_examined_sum','Tmp_table_sum','Filesort_sum','Full_scan_sum')

so how can I find out the meaning of these items?