Five wake channels are available; each is controlled by a pair of column-name parameters that select the (real, imaginary) columns of the SDDS impedance file (INPUTFILE, with the frequency column named by FREQCOLUMN):
| parameter pair | physical meaning | impedance units |
| ZL_REAL, ZL_IMAG | longitudinal monopole, ΔE ∝ ZL ⋅ I | Ω |
| ZXD_REAL, ZXD_IMAG | transverse x dipole, Δx′∝ ZxD ⋅⟨x⟩I | Ω∕m |
| ZYD_REAL, ZYD_IMAG | transverse y dipole, Δy′∝ ZyD ⋅⟨y⟩I | Ω∕m |
| ZXQ_REAL, ZXQ_IMAG | transverse x quadrupole, Δx′∝ x ⋅ ZxQ ⋅ I | Ω∕m2 |
| ZYQ_REAL, ZYQ_IMAG | transverse y quadrupole, Δy′∝ y ⋅ ZyQ ⋅ I | Ω∕m2 |
Any column-name parameter left at its default (NULL) disables that wake; at least one wake must be enabled. A single SDDS file typically holds all five channels. The sign and Fourier conventions match those of ZLONGIT and ZTRANSVERSE (see also wake2impedance and trwake2impedance in the elegant distribution).