The overall appearance of the HOMO and LUMO molecular orbitals within each of the anthracene segments basically maintains that of the monomer, with a series of lobes at the sides of each hexagon and a nodal plane along the long axis at the HOMO energies, and banana-like intensities along the acene segment's short axis at the LUMO energies. For all the dimers, experiment and theory show a nice agreement in this respect, as well as in the varying junction-dependent signal that further confirms the assignment of their chemical structure. This is shown in Fig. ), which compares the frontier orbitals as measured by constant height conductance maps, and in the extended Fig. , which includes more molecular states and shows how their conductance maps measured with different STM scanning modes compare to theory for each of the products. It is important to notice here that, in the theoretical simulation, dangling bonds created after the cleavage of C-Br bonds have been saturated by hydrogen. Therefore, the good agreement between the simulated STM images and the experiment indicates that, whether they are radicals or are indeed saturated by H, the molecules remain approximately planar and the observed molecular states are mostly derived from carbon  orbitals. b) -1.060 V, d) 1.820 V, f) -1.120 V, h) 1.850 V, j) -1.140 V, l) 1.660 V, n) -0.940 V, p) 1.650 V, r) -0.935 V, and t) 1.650 V. Scale bar is 6 Å. The images are acquired with Cl-functionalized probes. In the calculations, the radicals left by debromination in d1 and d3 have been saturated by H.