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cyclabs: absorption line, cyclotron

A cyclotron absorption line as used in pulsar spectra. See Mihara et al., Nature, 1990 or Makishima et al. PASJ, 1990.

...\frac{(W_{2h}E/2E_{cycl})^2}{(E-2E_{cycl})^2+W_{2h}^2} \right]

par1=$D_f$ depth of the fundamental
par2=$E_{cycl}$ cyclotron energy
par3=$W_f$ width of the fundamental
par4=$D_{2h}$ depth 2nd harmonic
par5=$W_{2h}$ width of the 2nd harmonic