which nebula has apparent magnitude at most 6.3?
Entity Entity Entity Entity Entity Entity Entity Entity Entity
m.0180sq m.0cqsrx m.03tfyz m.03rv_9 m.05br1d m.03s0r1 m.01jn15 m.01v8lq m.01yr9f
Orion Nebula Flame Nebula Omega Nebula Carina Nebula California Nebula Lagoon Nebula Trifid Nebula Eagle Nebula North America Nebula
class literal
astronomy.nebula 6.3^^http://www.w3.org/2001/XMLSchema#float
astronomy.nebula type.float
Nebula 6.3
none <=
astronomy.celestial_object.magnitude
Apparent Magnitude
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :astronomy.nebula . 
FILTER (?x1 <= "6.3"^^<http://www.w3.org/2001/XMLSchema#float>)
?x0 :astronomy.celestial_object.magnitude ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND astronomy.nebula (le astronomy.celestial_object.magnitude 6.3^^http://www.w3.org/2001/XMLSchema#float))