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IWR1443BOOST: Antenna coordinates

Part Number: IWR1443BOOST

As shown in the figure, the transmission antennas tx1, tx2 and tx3 are on the plane. Obviously, tx2 is different from tx1 and tx3. Assuming tx1 as the coordinate origin (0, 0), the coordinate of tx3 is (2λ, 0), what is the coordinate of tx2?