How to get the dBc unit in Cadence spectrum analyse, please?

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dbc unit

Hi,
I am doing a Δ-Σ Fractional-N Frequency Synthesizer, and I want to know how to analyse the output spectrum in Cadence spectre simulation, please?
I do the DFT analyse to the output signal, and change Y axis of the DFT output result to dB10 format, but I find the spectrum analyse use the unit of dBc, how can I get this unit in Cadence tools, please?

Thank you!
Best regards!
 

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