We use unity-norm spherical harmonics as described in sec. B.8 of
Dahlen and Tromp [1998] and the G-Cubed article to expand the tomographic
and geodynamic models at discrete layers with mid-layer depth .
The sets of and -coefficients
we then combine into ``model'' files whose format is given
in Table 1.
actual entry | example or note |
number of layers, e.g. 10 | |
in km, starting with the deepest level, eg. 2850 | |
e.g. 31 | |
always added, even though identical to zero | |
... | |
in km, next highest level, e.g. 2800 | |
same as above, redundant | |
... | |
in km, shallowest level, e.g. 0 | |
... |