RAC tnsnames Load Balance parameter

HI.

I have a RAC version 10.2.0.4 with the next tnsnames entry, and my question is, what's the difference in the parameter "LOAD_BALANCE" between "YES" and "ON"..?

-

FONATOP =
  (DESCRIPTION =
    (ENABLE = BROKEN)
    (ADDRESS_LIST =
      (LOAD_BALANCE = yes)
      (FAILOVER = yes)
      (ADDRESS = (PROTOCOL = TCP)(HOST = p480db1-vip)(PORT = 1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = p480db2-vip)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = fonatop)
      (FAILOVER_MODE =
        (TYPE = SELECT)
        (METHOD = BASIC)
        (RETRIES = 120)
        (DELAY = 5)
      )
    )
  )
-

Regards.