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TL431LI: About figure 7-3, 7-4

Part Number: TL431LI

Hi team,

In the figure 7-3 and 7-4, it says VKA=VREF at the lef top of the graph.

But VKA is variable in the charactoristic.

What does VKA=VREF means in this grapf?

Does it mean VKA_max=VREF?

Also, I want a explaination for the meaning/ difference of this two figures.