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Signature: find_contaminated_sites(lat: decimal number, decimal degrees (WGS84), required; lon: decimal number, decimal degrees (WGS84), required; radius_km: decimal number, kilometres, optional, default 1; limit: integer, items, optional, default 50; offset: integer, items, optional, default 0).","signature":"find_contaminated_sites(lat: decimal number, decimal degrees (WGS84), required; lon: decimal number, decimal degrees (WGS84), required; radius_km: decimal number, kilometres, optional, default 1; limit: integer, items, optional, default 50; offset: integer, items, optional, default 0)","parameters":[{"name":"lat","type":"number","schema":{"type":"number"},"required":true,"default":null,"description":"Centre coordinate (WGS84). Unit: decimal degrees (WGS84).","unit":"decimal degrees (WGS84)","display_type":"decimal number"},{"name":"lon","type":"number","schema":{"type":"number"},"required":true,"default":null,"description":"Centre coordinate (WGS84). 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