Assertion: solar panel's cell | /r/HasProperty | placed flat
Facets:
value: on a rooftop
type: LOCATION
value: on other surface
type: LOCATION
value: typically
type: DEGREE
Source sentences:
text: But very little attention has been paid to the best ways of arranging those cells, which are typically placed flat on a rooftop or other surface, or sometimes attached to motorized structures that keep the cells pointed toward the sun as it crosses the sky.