Geoffrey_Coram
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Spurs are fixed-frequency (eg, 60Hz) components to what is supposed to be a dc supply, right?
So, you could put a small amplitude sine source in series with your dc voltage source.
Vdc (extra 0) vsource dc=5.0 Vspur (vdd extra) vsource type=sine freq=60 ampl=1u
where "vdd" is the net where the dc source was originally attached.
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