Examples of three frequencies (f ∼ 450.8 μHz, f ∼ 574.0 μHz and f ∼ 710.4 μHz) as a comparison of the amplitude and frequency modulation in PG 0101+039 from stamp-decisive photometry. The sizes of eight types of pixels are labeled in the outside legend. Amplitudes are normalized to units and frequencies are shifted to their averages as represented by the dashed horizontal lines.