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For Princeton University Department of Chemistry in 2015-2026, the graph shows 71 visible PIs and 121 internal PI collaborations. The main research signal is Chemistry as the leading field (17% of slots across 24 PIs; 24 labels), Atomic and Molecular Physics, and Optics as the leading subfield (12% of slots across 20 PIs; 20 labels), and Spectroscopy and Quantum Chemical Studies as the leading topic (5% of slots across 11 PIs; 11 labels). That is a healthy pattern, with enough links to reveal several interpretable groups rather than one undifferentiated component. The most prominent PIs by weighted works are Paul J. Chirik (141.5 weighted works; Asymmetric Hydrogenation and Catalysis, Catalytic C–H Functionalization Methods). The clearest collaboration lines are R. J. Cava and Weiwei Xie (26 shared works, weight 19.3). The strongest breakdown groups are group 1 with 10 PIs, 11 internal connections, weight 81.8, around Atomic and Molecular Physics, and Optics, Materials Chemistry, Condensed Matter Physics, led by R. J. Cava, Leslie M. Schoop, Andrew B. Bocarsly.