Plotting Magnetic flux density in air using " Cut Plane data set "

Hi ,

I'm building a three axis magnetic flux coils. I need to visualize the mf.Bx / mf.By / mf.Bz on desired planes. when i add a " Cut Plane " in dataset and select an XY axis and plotting the air is not covered in the plot and when i plot in 2D graph in "Surface" and "contour" imnot getting flux in air. I just getting metal part of it.

any idea how to sort it.

Regards