1 Correction to: Found Comput Math https://doi.org/10.1007/s10208-018-9373-4

In the published article, Figure 5 corresponds to an eigenfunction associated not with the first smallest positive eigenvalue. A correct eigenfunction of the latter is depicted in Fig. 1 here. Note that this eigenfunction is axisymmetric, as can be seen from Fig. 2 where its radial, azimuthal and vertical components are plotted on different meridian sections.

Fig. 1
figure 1

Test 2. Beltrami field corresponding to the smallest positive eigenvalue

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Fig. 2
figure 2

Cylindrical components of the eigenfunction corresponding to the smallest positive eigenvalue. Radial (top), azimuthal (bottom left) and vertical (bottom right) components of the eigenfunction are depicted on the half of the torus and three meridian sections

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