The influence of pulse length, coupling frequency distributions, and spectral linewidths on the traces recorded by pump-detect block are well studied in the context of dipolar spectroscopy. While these affect the form factor of the time traces, we do not need to consider them here as all DEERATom traces were recorded with the same pulse parameters and so will be affected equally. Thus for high fidelity readout the pump-detect block must be equally sensitive to in-and anti-phase coherences. This is conveniently demonstrated by simulating traces for which the initial state is either a pure in-or anti-phase coherence on the detection spin, using the "single molecule" model from previous simulations (Figure ). From this we conclude that the pump-detect block is an effective way to measure the expectation values of both in-and anti-phase coherences.