{
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    "variance": "Population-weighted decomposition of grid-cell variance into within-city and between-city components. The 95% interval comes from 250 spatial block-bootstrap draws.",
    "matching": "Within each city, 106 greener and greyer grid cells were paired under calipers for built signal, population, building count, and spatial distance. The result is an observational association.",
    "access": "Straight-line distance to observed cool Landsat cells meeting an NDVI threshold; neither walking time nor a verified register of accessible cooling places.",
    "caveat": "Landsat measures daytime land surface temperature, not nocturnal near-surface air temperature. Matched greenness estimates are observational associations, not causal effects."
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