1.   The neon is in turn chilled by an ammonia coolant that circulates through an external radiator.

2.   During their spacewalk on Thursday, Barry and Forrester installed a tank of ammonia coolant and trays of experimental materials to the outside of the space station.

3.   On Thursday, they attached a bulky container filled with ammonia coolant and two briefcaselike boxes filled with samples of various materials to Alpha.

4.   They installed a bulky container filled with ammonia coolant to the space station.