In the original publication, the captions of Figs. 4 and 5 are correct, but the graphs have been erroneously switched between both figures. In the corrected version below, Fig. 4 correctly shows the result of the lattice-based UC in which the computation times of the ROMs exceed the computation time of the FOM, while Fig. 5 correctly shows the results of the shifted UC in which the computation times of the ROMs are significantly smaller than the computation time of the FOM.
(a) Dispersion curves of lattice-based UC with underneath relative errors. (b) Computation times of ROM setup and dispersion curve calculation for lattice-based UC. The IBC calculation time is further divided: 
denotes the time to apply the Bloch–Floquet BCs (Eq. (3)) and 
denotes the time to compute the eigenvalue problem (Eq. (2)).
(a) Dispersion curves of lattice-based UC with underneath relative errors. (b) Computation times of ROM setup and dispersion curve calculation for lattice-based UC. The IBC calculation time is further divided: denotes the time to apply the Bloch–Floquet BCs (Eq. (3)) and denotes the time to compute the eigenvalue problem (Eq. (2)).
(a) Dispersion curves of shifted UC with underneath relative errors. (b) Computation times of ROM setup and dispersion curve calculation for shifted UC. A break in the time axis is present. The IBC calculation time is further divided: 
denotes the time to apply the Bloch–Floquet BCs (Eq. (3)) and 
denotes the time to compute the eigenvalue problem (Eq. (2)).
(a) Dispersion curves of shifted UC with underneath relative errors. (b) Computation times of ROM setup and dispersion curve calculation for shifted UC. A break in the time axis is present. The IBC calculation time is further divided: denotes the time to apply the Bloch–Floquet BCs (Eq. (3)) and denotes the time to compute the eigenvalue problem (Eq. (2)).
