How to export data (e.g. the B1 field)

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One needs to be careful with the naming of the quantities. Notice that B1(x,y,z,f0) refers to a field with two components, namely (B1+, B1-) !!!! I personally find the name a bit unfortunate but it was directly taken from MRI jargon where they denote B1 to the RF B-field to distinguish it from the static magnetic field, denoted as B0.

Do NOT confuse with B(x,y,z,f0) that is a C^3 quantity with (Bx, By, Bz) components!!

Check in the manual B1(x,y,z,f0) for more details.