Table 7: Electron densities in ${\rm cm^{-3}}$ derived using the [S III] 33.4/18.7 ${\rm ~ \mu m}$ line ratio.
Source $\left ( [S {\sc iii}]\ {33.4 \over 18.7} \right )_{\rm o}$ $n_{\rm e}$ ([S III])

IRAS 01045 <0.38 >2582

IRAS 10589 0.71 $\pm$ 0.21 1038 (+ 748, -365)

IRAS 11143 1.29 $\pm$ 0.39 352 (+ 359, -181)

IRAS 12063 0.67 $\pm$ 0.20 1140 (+ 795, -389)

IRAS 12073 0.64 $\pm$ 0.20 1219 (+ 897, -423)

IRAS 12331 0.99 $\pm$ 0.30 589 (+ 486, -243)

IRAS 15384 0.71 $\pm$ 0.21 1036 (+ 739, -363)

IRAS 15502 1.00 $\pm$ 0.31 583 (+ 499, -245)

IRAS 16128 1.55 $\pm$ 0.50 217 (+ 308, -152)

IRAS 17160 1.16 $\pm$ 0.36 438 (+ 417, -207)

IRAS 17221 1.09 $\pm$ 0.36 496 (+ 495, -234)

IRAS 17279 1.99 $\pm$ 0.67 <333

IRAS 18032 1.19 $\pm$ 0.41 415 (+ 465, -215)

IRAS 18479 0.36 $\pm$ 0.18 2836 (+ 5764, -1259)

IRAS 19442 1.86 $\pm$ 0.73 <467

IRAS 19598 0.44 $\pm$ 0.16 2103 (+ 2137, -786)

DR21 0.95 $\pm$ 0.39 639 (+ 829, -317)

IRAS 23133 0.44 $\pm$ 0.16 2140 (+ 2152, -796)

**Table 7:** Electron densities in ${\rm cm^{-3}}$ derived using the [S III] 33.4/18.7 ${\rm ~ \mu m}$ line ratio.
Source	$\left ( [S {\sc iii}]\ {33.4 \over 18.7} \right )_{\rm o}$	$n_{\rm e}$ ([S III])
IRAS 01045	<0.38	>2582
IRAS 10589	0.71 $\pm$ 0.21	1038	(+ 748, -365)
IRAS 11143	1.29 $\pm$ 0.39	352	(+ 359, -181)
IRAS 12063	0.67 $\pm$ 0.20	1140	(+ 795, -389)
IRAS 12073	0.64 $\pm$ 0.20	1219	(+ 897, -423)
IRAS 12331	0.99 $\pm$ 0.30	589	(+ 486, -243)
IRAS 15384	0.71 $\pm$ 0.21	1036	(+ 739, -363)
IRAS 15502	1.00 $\pm$ 0.31	583	(+ 499, -245)
IRAS 16128	1.55 $\pm$ 0.50	217	(+ 308, -152)
IRAS 17160	1.16 $\pm$ 0.36	438	(+ 417, -207)
IRAS 17221	1.09 $\pm$ 0.36	496	(+ 495, -234)
IRAS 17279	1.99 $\pm$ 0.67	<333
IRAS 18032	1.19 $\pm$ 0.41	415	(+ 465, -215)
IRAS 18479	0.36 $\pm$ 0.18	2836	(+ 5764, -1259)
IRAS 19442	1.86 $\pm$ 0.73	<467
IRAS 19598	0.44 $\pm$ 0.16	2103	(+ 2137, -786)
DR21	0.95 $\pm$ 0.39	639	(+ 829, -317)
IRAS 23133	0.44 $\pm$ 0.16	2140	(+ 2152, -796)

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