Fig. provides an example of fitting with the model from Eq. 2, including the contributions of each component to a scattering curve. We see that the Porod term (proportional to I 0 ) in Eq. 2 mainly contributes at low q values (q < 0.5 nm -1 ), and reflects the scattering from large particles such as struvite crystals. On the other hand, the OZ term (proportional to I 1 ) contributes to scattering at supramolecular length scales at 0.5 < q < ~10 nm -1 , and measures the extent of fluctuations in the aqueous medium's structure. The I(q) ∝ q 0 plateau (0.5 < q < 2 nm -1 ) and the local intensity minimum (4 < q < 10 nm -1 ) are modelled by this term. Nominally, we may consider two peaks to model the structure of an aqueous medium for q > 10 nm -1 , due to the presence of two maxima with centroids at q of ~20 nm -1 and ~29 nm -1 . However, they cannot be accurately fitted with only two functions, each in the form of our broad peak expression (i.e. I 2 -dependent in Eq. 2), or by other peak functions such as the pseudo-Voigt. Moreover, the peak feature in water at ~29 nm -1 is known to evolve into a mere shoulder with increasing temperatures . As mentioned before, the considered part of the scattering pattern manifests the molecular-level structure of water and can be merely approximated with simple functions as the one in Eq. 2. Additional terms or asymmetric peak functions should be used, which would account for polydispersity in network O-O distances and the tetrahedral structure of water . To simplify this issue, we use a single broad peak expression in Eq. 2 and only for q up to ~21.3 nm -1 . This way, we correctly represent the rising shoulder of the peak, to account for a crossover with the OZ contribution preceding the peak. Thus, the extracted values of d and I 2 are interpretable, while ξ peak and m become mere parameterizations of the peak's shape (see the extrapolated fitting curve in Fig. ). The fit parameters for the entire series are summarised in Fig. . We excluded the trend in d as it was practically constant at d = 0.311 ± 1.0E-4 nm for all the curves.