How to model a 3 phase transformer in femm 4.2 for doing its performance analysis?

Hi! I am modelling a 3 phase transformer in femm 4.2 software (No Catia) and trying to do its performance analysis ( for Assembly). Also, I am trying to optimize its design by reducing its stray losses and I have successfully completed design of single phase transformer in this context. the problem lies in 3 phase core. I am not getting the concept as to how it is calculating losses inside?
Till now I have made two separate models: In 1 model where it is showing me flux lines but I am not able to get the losses there and in 2nd model I am getting losses correctly but there it is not at all showing flux lines.
Can u please suggest me something on this? A reason maybe that why am I facing such a problem!

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