Zero-bias differential specific resistance ρ as a function of temperature T, at various magnetic fields. Solid lines are fits to power-law expression ρ = A T p. T * is the crossover temperature from power law to saturation behaviour, extracted from when the specific resistance goes a fixed percentage above its minimum value. This percentage range was chosen to reflect the width of the crossover region, and to pass a self-consistency check with extrapolated power-law fits (Supplementary Section XI.G). Vertical (lower, upper) error limits are (5%, 150%) above minimum resistance, the centre value is 77.5% above minimum and the horizontal error limits are the temperatures corresponding to the (lower, upper) resistance values.
