Fig. S11.

Validation of two-parameter background subtraction, for the same sets of background scattering patterns as in Fig. S8 and again using the average of the patterns in a group as the background B(q, Φ) for that group. The residuals after subtraction of αB(q, Φ) + β (see text for formulae for α and β) from representative individual background patterns are shown (A) as 2D images and (B) as azimuthally averaged I(q).