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Fig. A.1.


Time-average IRC+10216 spectrum currently achieved in this project at the 3 mm atmospheric window, with periods and phases derived for spectral lines following the procedure described in Sect. 3. The error bars on the periods are also displayed. The sizes of the blue dots for each line are proportional to the percentage of the observed epochs where the flux exceeds the defined tolerance η(vl) (see Sect. 3). Larger dot sizes and smaller error bars mean more and better constrained periodic variability. The period and phase 0 derived from the IR data are plotted as a blue dashed and red dotted lines, respectively, for comparison. The species C2H and C4H are in antiphase with respect to the rest of molecules, which in turn display a delay of ~60–70 days with respect to the average phase 0 of the IR bands.

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