Panel I: temperature–rotation diagram for a sample of 34030 stars (coloured circles indicating the variability range) with rotation periods determined by McQuillan et al. (2014), along with 55501 stars where the authors found a period but evaluated it as not significant (beige dots; see panel III for a better visualization). Panel II: sample of 34030 stars with determined rotation periods in grey and 55501 stars with non-significant rotation period determinations in beige. For panels II and III, only the stars from sample A (panel II) and sample B (panel III) are shown in colour; see Table 1 for the properties of samples A and B. Panel II illustrates the stellar sample A, selected by near-solar rotation period and temperatures from 5000 to 6000 K. Panel III illustrates stellar sample B, which contains stars with near-solar effective temperature and a broad range of rotation periods. The Sun is represented by the solar symbol ⊙.