All important parameters are defined per winding. The L_BASE is the inductance of each of the six windings. Rated current I_{R BASE} is also defined per winding. Driving all windings with this current results in a temperature rise of 40°C. The definition of saturation current is a little more complicated. I_{SAT BASE} is defined as the current where inductance drops by 20% when all windings are driven by this current. Of course, saturation current is a matter of the core and not of the winding. Therefore, current of not used windings can be used for other windings. The same is true for the voltage-time-product.