Before revision: There are many different ways of specifying the linearity of a power amplifier including, P1dB, Inter-modulation Distortion (IMD), AM-to-PM, spectral regrowth and Noise Power Ratio (NPR).
After revision: There are many different ways of specifying the linearity of a power amplifier , including P1dB, Inter-modulation Distortion (IMD), AM-to-PM, spectral regrowth and Noise Power Ratio (NPR).