Table 3: Stars of the investigated open clusters with peculiar $\Delta a$-values; No. 17 of NGC 6756 is most probably an unreddened foreground star.
Cluster No1 No2 X Y V a $\sigma$ (g1-y) $\sigma$ $\Delta a$ (B-V) $\Delta a$ (b-y) $\Delta a$
NGC 6705 51 7730 85.1 419.6 11.84 0.695 0.005 -0.558 0.006 +0.045 +0.383 +0.046    
  56 7777 91.2 429.9 13.18 0.586 0.010 -0.571 0.005 -0.059 +0.384 -0.063    
  215 8157 267.5 520.4 12.00 0.674 0.007 -0.596 0.008 +0.037 +0.380 +0.026    
NGC 6756 (17) 33 120.0 176.3 14.91 0.737 0.006 -0.238 0.006 +0.052     +0.661 +0.051
  46 24 234.9 233.4 14.51 0.741 0.009 -0.218 0.008 +0.049     +0.670 +0.053
  52 66 256.5 440.6 15.74 0.629 0.012 -0.209 0.011 -0.067     +0.706 -0.067
Col. 1: cluster name;    
Col. 2: notation sorted after X and Y, respectively (Fig. 1);    
Col. 3: notation according to Sung et al. (1999; NGC 6705), Delgado et al. (1997; NGC 6756);    
Cols. 4, 5: X and Y coordinates in the finding charts (Fig. 1);    
Col. 6: Johnson V magnitude;    
Cols. 7, 8: mean a-index and its standard deviation;    
Cols. 9, 10: mean (g1-y) value and its standard deviation;    
Col. 11: deviation from cluster line a0 = a + b $\cdot(g_{1}-y)$ using the corresponding constants as listed in Table 2;    
Col. 12: (B-V) from the literature;    
Col. 13: deviation from cluster line a0 = a + b $\cdot(B-V)$ using the corresponding constants as listed in Table 2;    
Col. 14: (b-y) from Delgado et al. (1997);    
Col. 15: deviation from cluster line a0 = a + b $\cdot(b-y)$ using the corresponding constants as listed in Table 2.    


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