Processing, Reconstruction and Data Analysis. Each sample scan was processed with the averaged
data of the 5 previously acquired reference scans. We only processed the transmission and dark-field images since
the differential phase-contrast images did not provide any meaningful information as it already is described in
ref. 22.
The transmission (T) and dark-field (D) signals are in general related to the attenuation and scattering coefficient
μ and ε of the sample by the Beer-Lambert law.