Now even though it'd be nice if the depolarization wave lined up perfectly with the electrodes, usually that's not the case, so what we end up looking at is the vector component that is parallel to the electrode.

现在，如果除极波和电极的方向平行，那非常理想，但通常情况并非如此，所以我们最终关注的其实是平行于电极的向量分量。