Amplitude of t_p

peak = A_spindle(t_p)

Slope of waveform

slope = max{0.5peak/(t_p − t₁),0.5peak/(t_p − t₂)}

Ratio of spindle and θ wave

R₁ = Ᾱ_spindle/Ᾱ_θ

Ratio of spindle and α wave

R₂ = Ᾱ_spindle/Ᾱ_α