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

Calculating dependencies ... done!
Dependency resolution took 1.09 s (backtrack: 0/20).

[ebuild  N     ] virtual/fortran-0-r1::gentoo  USE="openmp" 0 KiB
[ebuild  N     ] app-shells/tcsh-6.24.16::gentoo  USE="nls -man" 939 KiB
[ebuild  N     ] sci-visualization/xd3d-8.3.1-r3::gentoo  USE="-doc -examples" 2137 KiB

Total: 3 packages (3 new), Size of downloads: 3076 KiB