Table 1: 23 published open clusters with $\Delta a$ CCD photometry taken from Bayer et al. (2000), Maitzen et al. (2001), Paunzen & Maitzen (2001, 2002) and Paunzen et al. (2002, 2003). The values for the reddening, age and distance modulus are from the same sources. The metallicity for all clusters is (within the errors) solar according to WEBDA and Lyngå (1987).
Cluster log t mV - MV E(B-V) $N_{{\rm stars}}$ Cluster log t mV - MV E(B-V) $N_{{\rm stars}}$
Collinder 272 7.20 13.06 0.47 111 NGC 6134 8.97 11.07 0.40 102
Lyngå  14 6.71 14.29 1.48 (var) 53 NGC 6192 7.95 13.00 0.68 98
Melotte 105 8.30 12.70 0.36 114 NGC 6204 7.60 11.50 0.43 319
NGC 2099 8.50 11.67 0.30 41 NGC 6208 9.00 10.54 0.18 41
NGC 2169 7.70 10.57 0.12 13 NGC 6250 6.50 11.18 0.38 48
NGC 2439 7.20 14.23 0.41 113 NGC 6396 7.20 13.34 0.96 (var) 105
NGC 2489 8.45 12.00 0.40 59 NGC 6451 8.13 13.74 0.67 146
NGC 2567 8.43 11.40 0.13 50 NGC 6611 6.90 13.72 0.86 (var) 79
NGC 2658 9.10 11.67 0.04 55 NGC 6705 8.30 12.73 0.43 312
NGC 3114 8.10 10.02 0.07 271 NGC 6756 8.10 14.67 0.80 65
NGC 3960 8.80 12.74 0.30 93 Pismis 20 6.60 15.30 1.24 (var) 238
NGC 5281 7.10 11.35 0.26 30          


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