  We have used the Antarctic Submillimeter Telescope and Remote Observatory
(AST/RO), a 1.7m diameter single-dish submillimeter-wave telescope at the
geographic South Pole, to determine the physical state of gas in the Galactic
Center region and assess its stability. We present an analysis based on data
obtained as part of an ongoing AST/RO key project: the large-scale mapping of
the dominant cooling lines of the molecular interstellar medium in the Milky
Way. These data are released for general use.
