Fig. 7.
Rotational and pulsational (dominant mode) variations of the sum of equivalent widths of 18 selected lines of O II, N II, and Si III. In left (right) panels data are plotted as a function of rotational (pulsational) phase, calculated using parameters of Table 6. In the lower panels one of the two variations has been removed by subtracting a sinusoidal fit, making the remaining variation appear more clearly.
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