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(a)

(b)

(c)

(d)

Figure 1: Real (solid line) and imaginary (dashed line) parts of the periodic harmonic wavelets ${\psi }_{\mathrm{0,0}}(x)$ , ${\psi }_{\mathrm{1,0}}(x)$ , ${\psi }_{\mathrm{2,2}}(x),$ and ${\psi }_{\mathrm{3,3}}(x)$ .