Table 3: Measurements of equivalent widths of four Balmer lines.
Cluster H$_\alpha$ H$_\beta$ H$_\gamma$ H$_\delta$
Windows (6540-6586) Å (4846-4884) Å (4318-4364) Å (4082-4124) Å
Markarian 38 6.5 $\pm$ 0.1 6.3 $\pm$ 0.1 6.70 $\pm$ 0.06 4.97 $\pm$ 0.09
NGC 6604 -2.2$\pm$ 0.1 2.5 $\pm$ 0.1 1.3 $\pm$ 0.1 2.2 $\pm$ 0.1
Dolidze 34 3.6 $\pm$ 0.1 4.1 $\pm$ 0.1 4.3 $\pm$ 0.1 4.8 $\pm$ 0.1
Berkeley 80 7.6 $\pm$ 0.2 5.0 $\pm$ 0.2 9.0 $\pm$ 0.2 6.0 $\pm$ 0.3
ESO 429-SC2 4.8 $\pm$ 0.1 4.6 $\pm$ 0.1 4.1 $\pm$ 0.1 4.0 $\pm$ 0.1
ESO 445-SC74 4.85 $\pm$ 0.07 5.4 $\pm$ 0.1 4.3 $\pm$ 0.2 3.7 $\pm$ 0.2
Bochum 2 4.4 $\pm$ 0.1 5.1 $\pm$ 0.1 5.6 $\pm$ 0.1 2.4 $\pm$ 0.1
NGC 2311 9.6 $\pm$ 0.1 13.2 $\pm$ 0.1 8.0 $\pm$ 0.1 6.3 $\pm$ 0.1
NGC 2409 5.8 $\pm$ 0.1 4.4 $\pm$ 0.1 5.1 $\pm$ 0.1 4.2 $\pm$ 0.1
Ruprecht 2 6.3 $\pm$ 0.1 6.8 $\pm$ 0.1 4.9 $\pm$ 0.1 3.34 $\pm$ 0.07
Pismis 7 6.1 $\pm$ 0.1 7.7 $\pm$ 0.2 3.7 $\pm$ 0.2 2.7 $\pm$ 0.1
Hogg 9 9.70 $\pm$ 0.07 8.8 $\pm$ 0.1 8.62 $\pm$ 0.09 5.5 $\pm$ 0.1
Hogg 10 5.73 $\pm$ 0.08 5.51 $\pm$ 0.09 4.4 $\pm$ 0.1 4.29 $\pm$ 0.09
Basel 18 7.83 $\pm$ 0.7 8.5 $\pm$ 0.1 7.58 $\pm$ 0.09 5.18 $\pm$ 0.08
Trumpler 21 6.5 $\pm$ 0.1 6.22 $\pm$ 0.09 6.0 $\pm$ 0.1 5.1 $\pm$ 0.1
BH 151 1.7 $\pm$ 0.1 1.2 $\pm$ 0.2 4.6 $\pm$ 0.1 3.6 $\pm$ 0.1
NGC 5281 7.3 $\pm$ 0.1 6.9 $\pm$ 0.1 7.2 $\pm$ 0.1 6.5 $\pm$ 0.2
Lyngå 1 11.5 $\pm$ 0.1 11.5 $\pm$ 0.1 7.8 $\pm$ 0.2 2.0 $\pm$ 0.1
Pismis 20 2.5 $\pm$ 0.1 2.0 $\pm$ 0.1 2.0 $\pm$ 0.1 -0.2 $\pm$ 0.1
Hogg 22 4.2 $\pm$ 0.2 2.1 $\pm$ 0.1 2.9 $\pm$ 0.1 2.1 $\pm$ 0.1
NGC 6204 8.88 $\pm$ 0.07 7.3 $\pm$ 0.1 7.49 $\pm$ 0.08 6.38 $\pm$ 0.09
Pismis 24 4.2 $\pm$ 0.1 3.6 $\pm$ 0.1 3.5 $\pm$ 0.2 -0.2 $\pm$ 0.1

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