Other output power than -20 or 0 dBm

Hello !

I've successfully changed the output power of device with the method explained here :http://support.dialog-semiconductor.com/programatically-change-tx-power.

SetWord16(RF_ENABLE_CONFIG13_REG, 0x0030); => -20

SetWord16(RF_ENABLE_CONFIG13_REG, 0xD030); => 0

But is it possible to have another output power than these two ?

In the case, would you mind detailing the relation between the register's value and the effective output power ?

Thanks in advance !

瓦尔