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Evolution of the peak effect with the angle between the c-axis and the external magnetic field, using pure and carbon substituted MgB2 single crystals field is presented. For given angle Θ(c,H) the peak effect appears only for H>H∗(Θ), where H∗(Θ) increases with the angle for the crystals x=0 and x=0.04, while practically remains constant for x=0.1 The peak critical current diminishes with angle...