Light curve of the 1 mm-continuum of CRL 618 using ancillary data compiled by Sánchez Contreras et al. (2004; black circles); new measurements are added from Reuter et al. (1997), Nakashima et al. (2007), Planck Collaboration Int. XVIII (2015), and this work (red circles). Some reference dates are indicated. Together with significant abrupt changes in short timescales of less than 0.1 yr, a periodic pattern with a period of ~17 yr is hinted (dotted line) on top of an overall, long-term smooth increase.
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