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    S
    In Sim4Life, the complex field S(x,y,z,f0) is (one half of) the cross product of the complex fields E(x,y,z,f0) and H(x,y,z,f0), both of which are the complex representation of harmonic fields (actually S = 0.5 E cross H*, where H* is the complex conjugate of H) The time-averaged Poynting vector (if you want the power flow) is given by Re(S) See the Wikipedia article (https://en.wikipedia.org/wiki/Poynting_vector) for more detail. EDIT: this post was corrected to reflect the notations used in Sim4Life, namley that S(x,y,z,f0) is already the time-averaged quantity and includes the factor 1/2.
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    H
    @LJ thanks
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    pcrespoP
    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.