It is known that local correlation approaches may lead to artifacts or discontinuities in potential energy surfaces. Due to the use of orbital maps, the partitioning of orbital pairs is assumed to be consistent along the reaction coordinate. In this case, the proposed multi-level approach should therefore not introduce additional discontinuities compared to the targeted accuracy of the local correlation approach. In order to show this, the potential energy surface of the carbonyl ligand dissociation from chromium hexacarbonyl is investigated, as shown in Fig. . It can be seen that pair-selected multi-level DLPNO-CCSD(T 0 ) results in a smooth dissociation curve for a target accuracy of TIGHTPNO while artifacts are recognizable for a target accuracy of NORMALPNO, especially close to the equilibrium distance of about 1.9 Å and between distances of 4.0 Å and 6.0 Å. Shown for short distances in Fig. (a), as an example, these artifacts are also apparent for NORMALPNO DLPNO-CCSD(T 0 ). With regard to the smoothness of this dissociation curve, no qualitative difference can be seen between pair-selected multi-level DLPNO-CCSD(T 0 ) and DLPNO-CCSD(T 0 ) for the same target accuracy.