Assertion: thunderstorm's lightning | /r/CapableOf | make x-rays
Facets:
value: in large quantities
type: OTHER
value: during the propagation of stepped leaders
type: TEMPORAL
Source sentences:
text: In the same year University of Florida and Florida Tech researchers used an array of electric field and X-ray detectors at a lightning research facility in North Florida to confirm that natural lightning makes X-rays in large quantities during the propagation of stepped leaders.