Galaxies in the SPT2349-56 protocluster core show an elevated [CI](2-1)/[CI](1-0) line ratio, implying warmer or denser gas than field galaxies at the same epoch.
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Evidence for environmental effects in the $z\,{=}\,4.3$ protocluster core SPT2349$-$56
Galaxies in the SPT2349-56 protocluster core show an elevated [CI](2-1)/[CI](1-0) line ratio, implying warmer or denser gas than field galaxies at the same epoch.