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Why do these two measurement blocks produce different readings from the same magnitude?

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Good night all,
As you can see, the original power_PWMGenerator3Level file includes measurements of converter output voltage Va by means of a voltage measurement block,
If a compare the lecture of Va measurement block to that of said Three-Phase VI Measurement block, I note that the earlier is a square wave while the latter rather resembles a sinusoidal wave.
Both measurement blocks are set to register the phase-to-ground so they actually should show the same waveform. The only difference I note is that while Va measurement block is comparing phase Va voltage to node 10 voltage, the 3-Phase VI measurement block is comparing phase Va voltage to ground – could you please revise and provide with an explanation?
Thanks in advance and BR!

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