Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_13978 ( "Stadium" text, "Capacity" real, "City" text, "Region" text, "Home Team" text, "Opened" real )

### Question ###
What capacity opened lessed than 1937 and is located in the region of champagne-ardenne?

### Accurate SQL ###

SELECT "Capacity" FROM table_13978 WHERE "Opened" < '1937' AND "Region" = 'champagne-ardenne'