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LTC2625 voltage head room with respect to GND

In the datasheet, voltage headromm is described as follows.

When drawing a load current from either rail, the output
voltage headroom with respect to that rail is limited by
the 30Ω typical channel resistance of the output devices;
e.g., when sinking 1mA, the minimum output voltage =
30Ω • 1mA = 30mV. See the graph Headroom at Rails vs
Output Current in the Typical Performance Characteristics
section.

what is the maximum value of the output headroom to GND, when the output sink the current?

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