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DS90UB953-Q1: Return Loss Over Frequency Band

Part Number: DS90UB953-Q1

May i can to know Figure 3. Return Loss Specification Graph in SNLA272 (Power-over-Coax Design Guidelines for DS90UB953-Q1), who length cable is conditions?  because i using 1m & 8m, but the 8m can't  meet is spec. what is based criteria for Coax cable?