HVC and IVC gas in the halo of the Milky Way
  We combine CaII/NaI absorption and HI 21 cm emission line measurements to analyse the metal abundances, the distribution, the small-scale structure, and the physical conditions of intermediate- and high-velocity gas in the Galactic halo. 
Nadya Ben Bekhti, Philipp Richter, Tobias Westmeier