Fig. 1
Modeled BPT diagram [O iii]/Hβ vs. [N ii]/Hα used to interpolate the values of 
and N/O for region 1 of NGC 3687. The blue diamond corresponds to the observed values in this [O iii]/Hβ vs. [N ii]/Hα diagram. The circles and triangles correspond to the values of the models obtained with the morphological factor fr set to 0.03 (filled sphere) and to 3.0 (thin shell), respectively. The colors correspond to the values of while the different values of N/O lead to models from left to right for increasing N/O.
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