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LMH5401-SP: Why different color is used for PCB pattern near IN pin?

Part Number: LMH5401-SP
Other Parts Discussed in Thread: LMH5401EVM-CVAL,


Looking at Figure 78 of the LMH5401-SP datasheet and Figure 33 of LMH5401EVM-CVAL Evaluation Module users guide, the color of PCB pattern near IN- pin is different from other pattern below. Why different color is used for the patterns?

Best regards,