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How to interpret the .four command in LTspice? (offline flyback smps simulation)

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Do you know how to interpret the results of the .four command in ltspice……

The attached LTspice offline flyback smps , when using the .four command for 50Hz , gives a spice error log which says harmonic number 1 is 50Hz and then says “Fourier component” is 0.2195.

What does the 0.2195 mean?

The RMS input current is 157mA


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