Science fiction authors Frank Herbert and Poul Anderson were among Vance's closest friends.

Entity and relation annotations:
id: 0
type: entity
value: text: Frank Herbert
labels: <Person>
id: 1
type: entity
value: text: Poul Anderson
labels: <Person>
id: 2
type: entity
value: text: Vance
labels: <Person>
id: 3
type: entity
value: text: Science fiction authors
labels: <Title>
type: relation
to_id: 3
labels: Person:holds_title:Title
from_id: 0