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AWR1243: the space between Tx antenna and space between Rx antenna?

Part Number: AWR1243

I have learned some information of antenna in AWR1243 EVM. I want to comfirm the information in the picture as follow.

The space between Tx is Lanmbda.

The space between Rx is Lanmbda/2.

So what is the exact value of Lambda?

Is the serial number of Tx and Rx right? Dose it match the name in the Radar Studio?