{
 "_what": "Distance (km) from each located production centre to the nearest Itiner-e road vertex, against matched control points drawn deterministically from the same geographic envelope. If the centres are not markedly closer to roads than the controls, then 'near a road' says nothing about being a production centre — the Roman road web is simply dense everywhere. This control is adverse to this site's own thesis by design.",
 "n_centres": 20,
 "n_road_vertices": 65952,
 "centre_nearest_km": {
  "alburnus-maior": 0.084,
  "aphrodisias-marble": 1.072,
  "astigi-ecija-figlinae": 0.783,
  "baelo-claudia": 2.609,
  "baetica-oil-zone": 7.362,
  "dokimeion": 2.74,
  "gaditan-garum-zone": 1.14,
  "karystos": 5.461,
  "la-catria": 5.566,
  "la-graufesenque": 0.753,
  "laurion": 2.27,
  "lixus": 0.109,
  "luna-carrara": 8.631,
  "mons-claudianus": 0.134,
  "mons-porphyrites": 4.64,
  "noricum-ferrariae": 2.772,
  "proconnesus": 27.954,
  "simitthus": 0.34,
  "troia-troia": 3.901,
  "vipasca": 0.564
 },
 "centre_median_km": 2.439,
 "control_median_km": 32.418,
 "ratio_centre_over_control": 0.075,
 "mine_median_km": 4.395,
 "n_mines": 1388,
 "ratio_centre_over_mine": 0.555,
 "endpoint_circularity": {
  "note": "Itiner-e names and terminates some segments AT known ancient places. A centre that IS a road endpoint returns ~0 km for a reason unrelated to our thesis. These are counted, not hidden.",
  "centres_on_a_road_under_1km": [
   "alburnus-maior",
   "astigi-ecija-figlinae",
   "la-graufesenque",
   "lixus",
   "mons-claudianus",
   "simitthus",
   "vipasca"
  ],
  "count": 7
 },
 "reading": "Median nearest-road distance: scored centres 2.4 km, ordinary mines 4.4 km, random matched points 32.4 km. Against the tight control (mines), the centres' ratio is 0.56 — and 7 of the 20 centres are road ENDPOINTS by Itiner-e's own naming, which manufactures whatever closeness there is. The road web is dense enough that proximity to a road does not, on this evidence, distinguish a scored production centre from any catalogued mine. The layer is spatial CONTEXT, not evidence for a road-to-production relationship."
}