The bipolar outflows themselves are probably oriented by the magnetic fields.

Once detected, this difference is correlated by computers, and a composite signal is created.

Radio waves from the same object reach the separate dishes at slightly different times.

It seems clear that the magnetic fields have a key role in all of this, even though many of the details are not well understood.

From Jack Welch "On-Camera" & Baselines In Interferometry: Correlation of Two Signals

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