Table 6: Extended diffuse emission regions around PNe that give a [S II] $\lambda 6716$/ $\lambda 6731$ ratio larger than 1.4 (from Kingsburgh & English 1992).
PN $I(\lambda6716)/I(\lambda6731)^a$
NGC 3195 1.98::
Fg 1 $\rm 1.45^{1.56}_{1.34}$
Pb 8 $\rm 1.40^{1.48}_{1.32}$
He 2-104 $\rm 1.71^{1.92}_{1.50}$
He 2-141 $\rm 1.62^{1.84}_{1.40}$
He 2-146 $\rm 1.52^{1.67}_{1.37}$
NGC 6072 $\rm 1.61^{1.80}_{1.42}$
Mz 2 $\rm 1.44^{1.55}_{1.33}$
IC 4634 2.14::
IC 4637 1.75::

a A "::" indicates an uncertainty larger than 20%.

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