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<div class="optiondescr">
This specifies which nuclei should be excluded from the Stochastic Liouville equation (SLE) simulation and only included in the final spectrum perturbationally, via post-convolution of the SLE-simulated spectrum with an isotropic stick spectrum of the nuclei marked for post-convolution. E.g. If <code>Sys.Nucs = '14N,1H,1H,1H'</code> and <code>Opt.PostConvNucs = [2 3 4]</code>, the only the nitrogen is used in the SLE simulation, and all the protons are included via post-conv