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SN65HVD10: figure 18/19 clarification in datasheet

Part Number: SN65HVD10

Team, am I misreading figures 18 and 19 for VOH and VOL vs. load current?

I think 18 is measuring VOA and 19 is VOB ?

1)   If true how why do the figures have negative voltage?

2)   Since VCC is 3.3V why does the x-axis go beyond 3.3V?