Fluke Versiv Series Technical Reference Handbook page 237

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The vertical scale shows the amplitudes of the crosstalk signals.
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The numbers on the scale are for reference only and do not
have units. The values on the scale are related to the limits for
NEXT in the selected test limit. For example, a crosstalk signal
that goes to 20 on the scale when you use a Cat 5 limit goes to
over 40 when you use a Cat 6 limit.
The orange, dashed lines are at the start and end of the cabling
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that the tester includes in the test results.
 The horizontal scale shows the distance along the cabling.
Chapter 6: Diagnose Copper Test Failures
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Figure 88. HDTDX Plot
The HDTDX Analyzer
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GPU114.EPS
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