These are the Tau Time Conversion Tables, containing the conversion tables from Tau time to Imperial time and from Imperial Time to Tau time. The centidec was used in the Battlefleet Gothic magazines. The codex has never gone smaller than a dec. In the novel: Fire Warrior Raik'ans and a Raik'ors are used to indicate seconds and minutes, but what their exact quantity is, is unknown. Therefore they cannot be put into the chart. See also the Tau Dictionary.