Changes of pulsation amplitudes and phases as a function of rotational phase for OGLE-BLAP-001 and ZGP-BLAP-08. Top-left: Amplitudes of the f₁ term (red) and 2f₁ term (blue, normalised by its average amplitude, 0.376, Table 1) in the combined data of OGLE-BLAP-001 derived from data in 0.05 (f₁) and 0.1 (2f₁) phase intervals of the suspected rotational period of 0.525500 d. Rotational phase 0.0 corresponds to BJD_TDB 2457000.0. Middle-left: Phases of the f₁ term derived from the same data. Bottom-left: Phases of the 2f₁ term derived from the same data. Top-right: Amplitudes of the f₁ term (red) and 2f₁ term (blue, normalised by its average amplitude, 0.385, Table 2) in the combined data of ZGP-BLAP-08 derived from data in 0.05 (f₁) and 0.1 (2f₁) phase intervals of the suspected rotational period of 1.52106 d. Rotational phase 0.0 corresponds to BJD_TDB 2459200.0. Middle-right: Phases of the f₁ term derived from the same data. Bottom-right: Phases of the 2f₁ term derived from the same data. The orange and light-green strips for ZGP-BLAP-08 panels mark rotational phase intervals near the maximum and the minimum of pulsation amplitude, respectively, for which phased light curves are shown in Fig. 11. The dashed lines in all panels mark the average values of amplitudes and phases from Table 1 for OGLE-BLAP-001 and from Table 2 for ZGP-BLAP-08.