Extracted energy distributions of the radiation field in the MMSN midplane at the location of Jupiter for the six gap profiles illustrated in Fig. 3, for the case of G₀ = 3000. The shaded light blue region demarcates the FUV region of the spectrum. For comparison, the black line represents the radiation field of the unperturbed solar nebula at the midplane, and hence at the surface of the CPD. The right ordinate indicates the ratio between the external FUV radiation field originating from the cluster and that found within the gap.