As the field is turned on, the density of states collapses from the constant to a Dirac comb, a series of Dirac δ δ functions, corresponding to the Landau levels separated Δ Δ ε ε x y = ℏ ℏ ω ω c . At finite temperature, however, the Landau levels acquire a width Γ Γ = ℏ ℏ τ τ i being τ τ i the time between scattering events. Commonly it is assumed that the precise shape of Landau levels is a Gaussian or Lorentzian profile.