[
 {
  "value": "0",
  "sigma": "1e-17",
  "source": "Jain, Lukens and Tsai, Appl Phys Lett (two series-array Josephson voltage standards)",
  "year": "1987",
  "field": "condensed matter",
  "id": "C1",
  "unit": "1",
  "quantity": "Josephson frequency-voltage ratio, fractional difference of two junction arrays (not two materials: the scored target in predictions.json says two superconductors, a weaker test)",
  "grade": "bound -2e-17 to 2e-17, secondary snippet, PRIOR-ART row 12",
  "bound_low": "-2e-17",
  "bound_high": "2e-17",
  "recalled": "no"
 },
 {
  "value": "0",
  "sigma": "8.6e-11",
  "source": "Janssen et al., New J Phys 13, 093026 (epitaxial graphene vs GaAs/AlGaAs, no difference within 8.6e-11)",
  "year": "2011",
  "field": "condensed matter",
  "id": "C2",
  "unit": "1",
  "quantity": "quantized Hall resistance, fractional difference graphene vs GaAs",
  "grade": "primary abstract, PRIOR-ART row 12",
  "bound_low": "",
  "bound_high": "",
  "recalled": "no"
 }
]