Canonical XSTAR 2.59g / MPI_XSTAR 2x3 xstar2table regression fixture.
Grid order: column=(1e20,1e21), rlogxi=(1,2,3), loopcontrol=1..6.
Canonical selected energy bins: 3414, range approximately 99.891 eV to 19939 eV.
Source: user-provided run_test.tar.gz produced by canonical xstinitable + XSTAR + xstar2table.
