Table 3: Line ratios observed (Cols. 2 and 3) and modeled with CLOUDY (Cols. 4 and 5) for the three clusters, on the cluster's center (on) and at about 3 $^{\prime \prime }$ off center (off). The effective temperatures of the ionizing stars and the ionization parameter derived are given in the last two columns.
  [OIII]/ $\rm H\beta $ (ob) [NII]/ $\rm H\alpha $(ob) [OIII]/ $\rm H\beta $ [NII]/ $\rm H\alpha $ T* (K) Log U
5253-1 on 3.62 0.080 3.50 0.079 42 000 -1.7
5253-1 off 4.35 0.066 4.35 0.066 47 000 -2.1
5253-5 on 7.44 0.069 7.3 0.070 75 000 -2.0
5253-5 off 5.60 0.089 5.3 0.090 60 000 -2.1
He 2-10 on 1.57 0.29 1.62 0.30 62 000 -2.9
He 2-10 off 1.29 0.20 1.24 0.20 55 000 -2.7


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