Table 2.

Sifting process steps.

Φ SYM-H (t) → res(t) = Φ SYM-H (t) − 〈Φ SYM-H (t)〉
δ(t) = res(t)
1. find local extrema of δ(t)
2. find upper and lower envelopes by using cubic spline → U δ(t)(t), L δ(t)(t)
3. find the mean envelope → m δ(t)(t) = mean {U δ(t)(t), L δ(t)(t)}
4. update δ(t) → δ(t) − m δ(t)(t)
if δ(t) is an intrinsic mode function
store C k (t) = δ(t)
res(t) = res(t) − δ(t)
repeat steps 1.–4.

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