# \#spectrum

**URL:** https://forum.plexim.com/tag/spectrum/350.md

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## [Overlaying reference harmonics onto the Scope FFT display](https://forum.plexim.com/t/overlaying-reference-harmonics-onto-the-scope-fft-display/936)

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**Author:** [@Josh\_SP](https://forum.plexim.com/u/Josh_SP)\
**Replies:** 2\
**Last updated:** [January 5, 2021, 4:07am UTC](https://forum.plexim.com/t/overlaying-reference-harmonics-onto-the-scope-fft-display/936 "2021-01-05T04:07:39Z")

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Hi all. I would like to use PLECS to plot the current harmonics of a number of different circuit topologies. For each simulation I would also like to overlay the measured harmonics with some reference harmonics limits t…