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_name_72 (up INTEGER, upstream VARCHAR)
  ### Question:
  What is the highest up:down ratio with 4 mbit/s upstream?
  ### Answer:
  SELECT MAX(up) AS :down_ratio FROM table_name_72 WHERE upstream = "4 mbit/s"