Extended Data Fig. 2: Extrapolation to zero intensity.

Extrapolation to zero intensity fits for representative xt bins (0.13 ≤ xt < 0.16 (a), 0.195 ≤ xt < 0.240 (b) and 0.290 ≤ xt < 0.350 (c)). The I (intensity) and I2 coefficients are common to all bins. χ2/d.o.f. = 38.7/40 for the simultaneous fit of all xt bins (d.o.f., degrees of freedom).