tokens: The TCS shall conform to the following requirements to be specified in the TCS specification : 1 . Temperature gradients 2 . Temperature stability 3 . Temperature uniformity 4 . Heat flux 5 . Heat storage 6 . Heat lift 7 . Electrical power allocation for heating and cooling 8 . TM / TC allocation for TCS parameter ; NOTE For requirements on TM / TC , see 4.3.5 . 9 . Mass allocation for TCS .