Spectrum output from a 2-FSK baseband modulator

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Hi, I have built a very simple simulink model which includes a 2-FSK baseband and spectrum analyzer.
The frequency seperation of the modulator is set at 400 KHz, therefore peaks are expected at + and - 200KHz.
I have read the results from the spectrum analyzer into an excel spreadsheet and compared them with the analogue fourier transform
of such a signal - see attached.
The simulink graph is blue and the analogue FT is red. As you can see although they are very close they are not matching exactly ?
The vertical scale is volts and the horizontal scale is Hz. I have made a number of observations :
1. The main peaks of the simulink graph at +/- 200 KHz is not exactly linear ?
2. The simulink side lobes at +/- 350, 450 and 550 KHz are not linear ?
3. The simulink side lobes at +/- 50KHz are substantially bigger than the analogue FT ?

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