Eight full 360 degree rotations of the sample were performed over 37 hours, each of them consisting
of n = 441 angular positions for ϕ. In total N = 3528 angular projections were acquired. Each full rotation was
divided into 21 blocks with each block consisting of 5 reference scans (without sample) and 21 sample scans for different angles ϕ. For each reference and sample scan, 7 phase-steps were acquired with an exposure time of
2 seconds per step. In addition to the rotation, the sample was also shifted by a random but logged number of
pixels in horizontal direction for each angular sample scan in order to avoid ring artifacts in the reconstruction.
More information on this method for ring artifact reduction is given in the supplementary information for this
article and ref. 30.