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For Harvard University Department of Physics in 2018-2020, the graph shows 57 visible PIs and 47 internal PI collaborations. The dominant subject mix is Physics and Astronomy as the leading field (35% of slots across 37 PIs; 37 labels), Atomic and Molecular Physics, and Optics as the leading subfield (17% of slots across 22 PIs; 22 labels), and Cosmology and Gravitation Theories as the leading topic (4% of slots across 6 PIs; 6 labels). The network looks reasonably well-rounded, with visible collaboration groups but not so much concentration that one field explains the whole department. The top weighted PIs are David A. Weitz (29.8 weighted works; Innovative Microfluidic and Catalytic Techniques Innovation, 3D Printing in Biomedical Research). The most visible ties are Mikhail D. Lukin and Hongkun Park (15 shared works, weight 6.5). The standout breakdown groups are group 1 with 6 PIs, 6 internal connections, weight 19.6, around Atomic and Molecular Physics, and Optics, Materials Chemistry, Artificial Intelligence, led by Mikhail D. Lukin, Philip Kim, Hongkun Park.