Fig. 13.
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log ([N II] λ5755/ [N II] λ6583) vs. SOT. The error bars, the grids, and the black arrow are the same as those in Fig. 11. The dust extinction corrected data points are in white. These corrections could be significant overcorrections for the low-ionization lines (see text). For undetected lines, the upper limits are denoted by arrows and are calculated using the 2σ flux values.
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