Returns the 1st simulated value of the n-th simulated spectrum in the spectrum list at the wavenumber specified by the 'wavenumber' property. If the spectrum is an ellipsometry spectrum, there are two simulated quantities: Psi and delta, or cos(psi) and tan(delta). In that case the 1st value is the psi-related quantity. The second quantity, related to delta, can be obtained using the function get_sim_val2.

Writing this property has no effect.