These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] sci-geosciences/harmonics-dwf-free-20241229::gentoo  846 KiB
[ebuild  N     ] sci-geosciences/libtcd-2.2.7_p3:0/1::gentoo  USE="-doc" 266 KiB
[ebuild  N     ] sci-geosciences/tcd-utils-20240222::gentoo  111 KiB

Total: 3 packages (3 new), Size of downloads: 1222 KiB