  The contribution to the potential caused by the ocean tides is 
computed using the bottom pressure field at an equi-angular 
latitude/longitude grid.

  The expansion is truncated to degree/order 64.


  The loading Love numbers are defined for the total Earth
system (solid Earth + here atmosphere). They were 
computed by P. Gegout (private communication, 2005). 
In accordance with this definition the Stokes coefficients,
(0,0), (1,0) and (1,1) are zero.

  Normalization: the Stokes coefficients are so-called "4-pi 
fully normalized" according to Heikassen and Moritz, 1979.

This mean for any m,n, the integral over the entire sphere

\int Y_m^n(\phi,\lambda) \cdot Y_m^n(\phi,\lambda) \cdot
\cos ( \phi ) d \phi d \lambda \cdot = 4 \pi


References:

1) L. Petrov, J.-P. Boy, "Memo on computing Stokes coefficients
   of the expansion of the atmosphere contribution to the
   geopotential into a series of spherical harmonics", 2005,
   Unpublished, 
   http://gemini.gsfc.nasa.gov/agra/agra_memo_01.ps

2) L. Petrov, J.-P. Boy, "Study of the atmospheric pressure 
   loading signal in very long baseline interferometry 
   observations", J. Geophys. Res., vol. 109, p. B03405,
   doi:10.1029/2003JB002500, 2004.

3) Lefevre, F., C. Le Provost and F.H. Lyard, How can we 
   improve a global ocean tide model at a regional scale?
   A test on the Yellow Sea and the East China Sea, 
   J. Geophys. Res., vol. vol. 105, 8707--8725, 2000.

4) W. Heikassen, H. Moritz, Physical geodesy, Graz, 1979, p. 31.

