Fig. S2.

Examples of the steps used to process the synchrotron data and extract volumes of N₂. Each image has dimensions 4 mm $\times$ 4 mm. (A) Raw grayscale image. (B) Image after undergoing nonlocal means filtering, registration to a dry scan, and resampling to align the registered voxels. (C) Difference image created by subtracting a brine scan from the experimental scan. (D) Nonlocal means filtered difference image. (E) Image where watershed segmentation algorithm has been used to identify N₂ in blue. (F) Image where individual volumes of N₂ have been labeled and colored separately.