Shows additional and raw data. Sheet A: Representative measured thickness of a collagen gel fibre using GaAs and Airyscan. Sheet B: Distributions of measured thicknesses of collagen gel fibres using Airyscan. Sheet C: Examining the effects of Undersampling and Oversampling in SR measurements. Sheet D: Measured thickness of human airway tissue in SR vs GaAs. Figs 3E, 3F, 3G and 5C: Underlying raw data accompanying the indicated figures in the main text.