  SWAG ("Survey of Water and Ammonia in the Galactic Center") is a multi-line
interferometric survey toward the Center of the Milky Way conducted with the
Australia Telescope Compact Array. The survey region spans the entire ~400pc
Central Molecular Zone and comprises ~42 spectral lines at pc spatial and
sub-km/s spectral resolution. In addition, we deeply map continuum intensity,
spectral index, and polarization at the frequencies where synchrotron,
free-free, and thermal dust sources emit. The observed spectral lines include
many transitions of ammonia, which we use to construct maps of molecular gas
temperature, opacity and gas formation temperature (see poster by Nico Krieger
et al., this volume). Water masers pinpoint the sites of active star formation
and other lines are good tracers for density, radiation field, shocks, and
ionization. This extremely rich survey forms a perfect basis to construct maps
of the physical parameters of the gas in this extreme environment.
