{
  "references": [
    {
      "key": "unknown",
      "source": "Unknown source"
    }
  ],
  "materials": {
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      "name": "Air",
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        },
        "tan_delta": {
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        }
      }
    },
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      "name": "Copper",
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      "color": "#e69567",
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        },
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      }
    },
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      }
    },
    "gold_const": {
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      }
    },
    "aluminum_const": {
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}