Assertion: scanner's field | /r/CapableOf | decrease to start forward scan
Facets:
value: steadily
type: MANNER
value: in magnitude
type: OTHER
value: at the left edge
type: LOCATION
Source sentences:
text: At the left edge, the field steadily decreases in magnitude to start another forward scan, and soon after the start, the beams unblank to start a new visible scan line.