Fig. 1
Extracted observed flux-calibrated spectra. From left to right and top to bottom: a) whole integrated spectrum of S156; b) subset of the spectrum of S162 showing the temperature sensitive line [O iii]λ4363; c) subset of the spectrum of S162 showing the temperature sensitive line [N ii]λ5755; and d) subset of the spectrum of S162 showing the temperature sensitive line [S iii]λ6312.
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