2D Data and tools that is used in the paper:
Örsvuran, Rıdvan, Ebru Bozdağ, Ryan Modrak, Wenjie Lei, and Youyi Ruan. “Double-Difference Measurements in Global Full-Waveform Inversions.” Geophysical Journal International, 2019. https://doi.org/10.1093/gji/ggz444.