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_13619027_9 (high_rebounds VARCHAR, date VARCHAR)

### Question ###
How many different values if the number is high rebounds can be found for the game on March 13?

### Accurate SQL ###

SELECT COUNT(high_rebounds) FROM table_13619027_9 WHERE date = "March 13"