  Anti-protonic hydrogen and helium atoms are analyzed. Level shifts and width
are expressed in terms of $\bar{p}$-nucleon sub-threshold scattering lengths
and volumes. Experimental data are compared to results obtained from the 2009
version of the Paris $N\bar{N}$ interaction potential. Comparison with 1999
version is also made. Effects of $N\bar{N}$ quasi-bound states are discussed.
Atomic 2P hyperfine structure is calculated for antiprotonic deuterium and the
significance of new measurements is indicated.
