First, field value is complex with real and imaginary parts, which can be positive and negative. For example, E=Er+i*Ei where Er and Ei can be positive or negative.
xyz means Ex,Ey and Ez, magnitute is abs(E)=sqrt(abs(Ex)^2+abs(Ey)^2+abs(Ez)^2).
Only real and imaginery shows phase,not the magnitude or absolute values.
Please refer this post
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