Table 3: CN number ratios.

Cluster		 $\frac{\rm CN_{weak}}{\rm CN_{strong}}$ $r_{\rm lower RGB}$ $r_{\rm upper RGB}$
NGC 288 9/7 $0.78\pm0.39$  
NGC 362 9/11 $1.22\pm0.55$ 2.46a
NGC 5286 2/4 $2.00\pm1.73$  
NGC 6656 (M 22) 10/6 $0.60\pm0.31$ 0.41b
Ter 7 14/0 $0.00\pm0.00$  
NGC 6809 (M 55) 13/2 $0.15\pm0.12$ 0.22c
NGC 7078 (M 15) 18/1 $0.06\pm0.06$  
  (12/7) ($0.60\pm0.29$)  
Pal 12 13/1 $0.07\pm0.07$  
NGC 104 (47 Tuc)   1.90d 1.8d
NGC 6839 (M 71) 13/9 0.69e 1.0e, 0.63g, 0.3h
NGC 1904 (M 79)     2.6b
NGC 2808     2.4f
NGC 3201     1.1f
NGC 5272 (M 3)     0.6f
NGC 5904 (M 5)     3.0f
NGC 6121 (M 4)     1.4f
NGC 6171 (M 107)     1.4f
NGC 6205 (M 13)     3.2f
NGC 6254 (M 10)     0.5f
NGC 6637     1.2f
NGC 6752     1.6f
NGC 6934     0.6f
NGC 7006     2-3.5b
NGC 7089 (M 2)     3.8f
a Smith & Mateo (1990);
b Harbeck et al. (2003b);
c Norris (1987);
d Briley (1997);
e Lee (2005);
f Smith (2002);
g Cohen (1999);
h Penny et al. (1992).


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