Amplitude of solar cycle brightness change as defined in Fig. 2. Orange solid line: solar case (M/H = 0.0); black solid line: hypothetical Sun calculated with M/H = 0.3 using solar atmosphere models; black dotted line: same as before, but using atmospheric models consistently recalculated with M/H = 0.3, i.e. the back-reaction of the radiation field on the atmospheric structure, and continuum opacity change due to a different electron concentration are considered. The yellow and grey shaded areas are the same as in Fig. 2.
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