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Why is characteristic impedance of TLs in nRF52840 QIAA Reference Layout v1.0 60 Ohm instead of 50 Ohm?

According to nRF52840 Product Specification v1.0, all the reference circuits are designed for use with a 50 Ω single-ended antenna. Why is the calculated result by AppCAD 60 Ohm? This  made me disturbed when drawing PCB layout. Can you help me this problem?

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