Frequency spectra and selected light curves for the β Cephei star SBL268. The analysis was performed with daily adjusted data, suppressing low frequencies. The notations and markings are the same as in Fig. A.3 where applicable. The frequencies found are f₁ = 8.3847d^-1, f₂ = 12.9891d^-1, and f₃ = 7.2748d^-1. The errors range from σ_f1 = 0.0004d^-1 to σ_f3 = 0.001d^-1 for the frequencies.