AD5290 Wiper Temperature Coefficient.

I've looked through the datasheet but I did not see a number for the wiper temperature coefficient.

It is noted that "The wiper resistance, RW, is a function of Vdd and temperature.  Contrary to the temperature coefficient of the Rab, which is only 35 ppm/°C, the temperature coefficient of the wiper resistance is significantly higher because the wiper resistance doubles from 25°C to 125°C."

Is there a graph that depicts this 'doubling'? Is it linear, exponential?

Thanks