(a) Centered hexagonal fibril packing; (b) Fibonacci fibril packing; (c) radially integrated profiles, derived from (a) and (b), here blue and black profiles, respectively, compared with the PDF data extracted from the untreated peripheral zone of the cornea, i.e. with the red profiles of Fig. 3 ▸(a) (cSAXS-SLS data set); (d) radially integrated profiles, derived from (a) and (b), here blue and black profiles, respectively, compared with the PDF data extracted from the cross-linked zone, i.e. with the green profiles of Fig. 3 ▸(b) (cSAXS-SLS data set).