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_name_63 (formula VARCHAR, refractive_index_es__5893nm VARCHAR)
### Question:
Which formula has a refractive index 589.3 at 1.97?
### Answer:
SELECT formula FROM table_name_63 WHERE refractive_index_es__5893nm = "1.97"