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For Columbia University Lamont Doherty Earth in 2015-2017, the graph shows 58 visible PIs and 35 internal PI collaborations. The dominant subject mix is Earth and Planetary Sciences as the leading field (42% of slots across 47 PIs; 47 labels), Atmospheric Science as the leading subfield (21% of slots across 26 PIs; 26 labels), and Climate variability and models as the leading topic (6% of slots across 10 PIs; 10 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 Richard Seager (13.7 weighted works; Climate variability and models, Soil erosion and sediment transport). The most visible ties are Alexander van Geen and Benjamín C. Bostick (10 shared works, weight 3.7). The standout breakdown groups are group 1 with 10 PIs, 18 internal connections, weight 14.7, around Atmospheric Science, Environmental Chemistry, Astronomy and Astrophysics, led by Yan Zheng, Joerg M. Schaefer, Gisela Winckler; group 2 with 8 PIs, 9 internal connections, weight 9.4, around Global and Planetary Change, Atmospheric Science, Economics and Econometrics, led by Richard Seager, Adam H. Sobel, Jason E. Smerdon.