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Fig. 2. (Color online) The 81 physics-related departments are categorized based on their location in the unit of administrative regions. The outer dark and light gray circular chart distinguishes the capital and non-capital regions, while the inner circular chart represents their respective sub-regions. For better visual inspection, we note that the regions in the inner pie chart are counterclockwise arranged in the same order as written in the legend (from the top left to the bottom right).
New Phys.: Sae Mulli 2024;74:610~620