How I model a magnetic core to spacing?

I test the trial version of Multisim Power Pro, and I tried to model a core of iron with the air gap. Could I only get back, point by point, the hysteresis cycle which already sees a gap, or there is a part that has such parameter as the gap? I also wonder if the full version has this ability and what exactly defines "Entry field smoothing" setting in the magnetic core part properties window? How I model a magnetic core to spacing?

It is a measure of the smoothing, which will be set up around the data points that define your B - H curve. Its purpose is to smooth out the B - H curve otherwise piece wise linear. This potentially helps makes the most representative defined curve of the real curve and also helps the convergent Simulator.

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