Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Archaeological Park and Ruins of Quirigua' has mentioned 'Population density' in the following places:
Occurrence Sentence Text Source
[15] The population density of the site has been estimated at 400 to 500 per square kilometer (1040 to 1300 per square mile) in the centre of the city during the Late Classic[16] with an estimated peak population of 1200xe2x80x931600;[17] surveys have revealed an average of 130 structures per square kilometer (338 per square mile) at the site, compared with 1449 structures/km2 (3767 per square mile) in central Copxc3xa1n.
[18] The low population density indicates that Quiriguxc3xa1 served as the focus for a dispersed rural population.