text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_30057479_1 (researched_at VARCHAR, geometry VARCHAR)
  ### Question:
  Where was d: ~50nm, l: ~600nm geometry researched?
  ### Answer:
  SELECT researched_at FROM table_30057479_1 WHERE geometry = "D: ~50nm, L: ~600nm"