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AWR1843AOP: Explanation on Errata item PACKAGE#02A Surface Wave Artifact from PCB

Part Number: AWR1843AOP

Dear Experts, 

could you please help to clarify Workaround #2 in Errata of AWR1843AOP for item PACKAGE#02A. 

Below picture shows the workaround:

Is my understanding correct ?

- green color is the PCB

- white cutouts are going through the complete PCB, so basically having trapezoidal holes in the PCB 

Is the 0.3mm marking placed incorrectly in above picture on the right ? Shouldn't it be from the device edge (black) to the edge of the PCB board ?

So something like this

Thanks and best regards,