[
 {
  "value": "3240",
  "sigma": "30",
  "source": "normal-mode lecture tables (0S2, about 54 min), Masters and Widmer 1995 catalogue not fetched",
  "year": "1995",
  "field": "seismology",
  "id": "Q14",
  "unit": "s",
  "quantity": "Earth free oscillation 0S2 period",
  "grade": "secondary rounded, PRIOR-ART row 19",
  "bound_low": "",
  "bound_high": "",
  "recalled": "no"
 },
 {
  "value": "1230",
  "sigma": "15",
  "source": "normal-mode lecture tables (0S0, about 20.5 min)",
  "year": "1995",
  "field": "seismology",
  "id": "Q15",
  "unit": "s",
  "quantity": "Earth free oscillation 0S0 period",
  "grade": "secondary rounded, PRIOR-ART row 19",
  "bound_low": "",
  "bound_high": "",
  "recalled": "no"
 },
 {
  "value": "2632",
  "sigma": "35",
  "source": "Zuern, Ferreira, Widmer-Schnidrig et al., Geophys J Int (0T2 at 0.38 mHz)",
  "year": "2015",
  "field": "seismology",
  "id": "Q16",
  "unit": "s",
  "quantity": "Earth free oscillation 0T2 period",
  "grade": "secondary rounded, PRIOR-ART row 19",
  "bound_low": "",
  "bound_high": "",
  "recalled": "no"
 }
]