**Table 1:** Detected sources: references indicate origin of specified coordinates.
Source	$\alpha_{2000} \; (\rm h\;m\;s)$	$\delta_{2000} \;(\hbox{$^\circ$ }\;\hbox{$^\prime$ }\;\hbox{$^{\prime\prime}$ })$	Previous ID $^{{\rm a}}$	Reference $^{{\rm a}}$	Notes
RCrA 1	19 01 41.5	-36 58 29	IRS2, TS13.1	2
RCrA 2 $^{{\rm b}}$	19 01 41.5	-36 58 59		17
RCrA 3	19 01 41.7	-36 59 54	H $\alpha$ 2	1
RCrA 4	19 01 48.0	-36 57 19	IRS5, TS2.4	2
RCrA 5	19 01 50.7	-36 58 07	HH 100-IR, IRS1, TS2.6	2
RCrA 6 $^{{\rm b}}$	19 01 50.9	-36 57 37		17	Very close to RCrA
RCrA 7 $^{{\rm b}}$	19 01 52.4	-36 57 37		17	Very close to RCrA
$\rho$ Oph A 1	16 26 17.3	-24 23 49	SKS9, ISO-Oph 21	6
$\rho$ Oph A 2	16 26 18.8	-24 24 21	SKS11, ISO-Oph 26 ???	17	Uncertain ID
$\rho$ Oph A 3	16 26 21.5	-24 23 07	GSS30, GY6, SKS12, ISO-Oph 29	6
$\rho$ Oph A 4	16 26 23.7	-24 24 40	GY21, SKS16, ISO-Oph 37	6	Falls on bad column
$\rho$ Oph E 1	16 27 21.6	-24 41 43	GY252, SKS36, IKT43, ISO-Oph 132	6
$\rho$ Oph E 2	16 27 24.8	-24 41 02	ISO-Oph 137	6
$\rho$ Oph E 3	16 27 26.9	-24 39 23	GY262, IKT53, ISO-Oph 140	6
$\rho$ Oph E 4 $^{{\rm b}}$	16 27 27.1	-24 41 31		17	Very faint
$\rho$ Oph E 5	16 27 27.2	-24 40 49	GY265, IKT54, ISO-Oph 141	6
$\rho$ Oph E 6	16 27 28.2	-24 39 32	GY269, IKT57, ISO-Oph 143	6
Ser A 1	18 29 56.6	+1 12 56	SVS4/2, GEL5	11	Very faint
Ser A 2	18 29 56.7	+1 12 35	SVS4/3	11	Very faint
Ser A 3	18 29 57.5	+1 12 57	SVS4/5 and	11	Unresolved double
			SVS4/6, GEL9
Ser A 4	18 29 57.9	+1 12 25	SVS4/7	11	Very faint
Ser A 5	18 29 57.9	+1 12 34	SVS4/8	11
Ser A 6	18 29 57.9	+1 12 43	SVS4/9 and	11	Unresolved double
			SVS4/10, GEL11
Ser A 7 $^{{\rm c}}$	18 30 00.1	+1 13 03	GCNM130	13	Off frame 7.0-9.3 $\mu$ m
Ser B 1	18 29 52.9	+1 14 55	GCNM53	13
Ser B 2	18 29 55.7	+1 14 31	CK9, GEL4, EC74, GCNM76	13
Ser B 3	18 29 56.8	+1 14 46	SVS2, CK3, GEL6, EC82, GCNM87	13	Unresolved double
			and GEL8, EC86, GCNM93
Ser B 4 $^{{\rm b}}$	18 29 57.2	+1 13 28		17	Peak in nebulosity?
Ser B 5	18 29 57.6	+1 15 31	GCNM100	13
Ser B 6	18 29 57.7	+1 14 05	SVS20, CK1, GEL10, EC90, GCNM98	13	Double Object
Ser B 7 $^{{\rm b}}$	18 29 58.1	+1 13 24		17	Peak in nebulosity?
Ser B 8	18 29 58.2	+1 15 21	CK4, GEL12, EC97, GCNM106	13	Falls on bad column
Ser B 9	18 29 58.7	+1 14 26	EC103, GCNM112	13
Ser B 10	18 29 59.2	+1 14 08	CK8, GEL13, EC105, GCNM119	13
Ser B 11 $^{{\rm c}}$	18 30 00.1	+1 13 03	GCNM130	13
Ser B 12	18 30 00.5	+1 15 20	CK2, EC118, GCNM136	13	Peaks on bad column
Ser B 13	18 30 02.1	+1 13 59	CK7, EC125, GCNM154	13	Very faint
Cha I 1	11 09 23.3	-76 34 35	C1-6, ISO-ChaI 189, KG82	15	Bad column in CVF1
Cha I 2	11 09 29.2	-76 33 30	ISO-ChaI 192, KG87	15	Out of frame in CVF1
Cha I 3	11 09 42.6	-76 35 01	C1-25, ISO-ChaI 199, KG93	15
Cha I 4	11 09 46.9	-76 34 49	C1-24, ISO-ChaI 204, KG97	15
Cha I 5	11 09 54.1	-76 34 26	C1-5, ISO-ChaI 223, KG109	15
Cha I 6	11 10 00.8	-76 34 59	WW Cha, C1-7, ISO-ChaI 231, KG116	15

$^{{\rm a}}$: Names and references from: 1) Marraco & Rydgren (1981) (H $\alpha$ ); 2) Taylor & Storey (1984) (TS, IRS); 3) Grasdalen et al. (1973) (GSS); 4) Greene & Young (1992) (GY); 5) Strom et al. (1995) (SKS); 6) Bontemps et al. (2001) (ISO-Oph); 7) Imanishi et al. (2001) (IKT); 8) Strom et al. (1976) (SVS); 9) Churchwell & Koornneef (1986) (CK); 10) Gomez de Castro et al. (1988) (GEL); 11) Eiroa & Casali (1989) (SVS4/?); 12) Eiroa & Casali (1992) (EC); 13) Giovannetti et al. (1998) (GCNM); 14) Hyland et al. (1982) / Jones et al. (1985) (C1-?); 15) Persi et al. (2000) (ISO-ChaI); 16) Kenyon & Gómez (2001) (KG); 17) this paper.
$^{{\rm b}}$: See Sect. 3.1.1 for a discussion of the sources not previously identified.
$^{{\rm c}}$: These two sources from the two different Serpens fields were determined to be different images of the same source.

Table 2: Fitting results: errors are given in parentheses (i.e. 7.84(16) $\leftrightarrow$ 7.84 $\pm$ 0.16); source names correspond to those in Table 1.
8 $\mu$ m 8 $\mu$ m Equivalent Line Widths (nm) Source Cont.

Source flux continuum $\tau_{{\rm Si}}$ $^{{\rm a}}$ $\tau_{11~ \mu {\rm m}}$ 6 $\mu$ m 6.8 $\mu$ m 7.6 $\mu$ m 13 $\mu$ m 15.2 $\mu$ m $\alpha$ $\alpha$ Group $^{{\rm b}}$ Notes

(Jy) flux (Jy) H₂O CH₄?? H₂O CO₂

RCrA 1 7.84(16) 7.79(16) -0.02(1) -0.06(1) 178(8) $^{{\rm c}}$ 17(1) $^{{\rm c}}$ 17(3) $^{{\rm c}}$ 247(25) 168(7) 0.56 0.58 b Strong 11 $\mu$ m emission

2 0.95(2) 1.24(3) 0.72(3) -0.27(4) 203(8) 57(4) 17(3) 0(0) 83(4) -0.96 $^{{\rm f}}$ -1.35 $^{{\rm f}}$ a Silicate too wide at long

$\lambda$ , probable 13 $\mu$ m error

3 0.27(2) 0.28(2) 0.22(1) -0.16(2) 147(15) $^{{\rm c}}$ 14(3) $^{{\rm c}}$ 0(0) $^{{\rm c}}$ 718(76) 0(0) -1.11 -0.96 b $\tau_{{\rm Si}}$ probably too small,

possible absorption bands

at 13 $\mu$ m, 14.25 $\mu$ m

4 1.74(110) 2.28(144) 0.71(3) -0.07(1) 271(10) 81(6) 6(1) 586(59) 253(11) 1.23 1.43 a Possible 10.5 $\mu$ m emission

5 22.46(44) 36.91(74) 1.35(5) -0.23(3) 206(8) 67(4) 14(2) 1535(155) 129(5) 1.30 1.79 a

6 0.94(3) 1.36(4) 0.95(4) -0.15(2) 204(7) 61(4) 11(2) 73(7) 97(4) -0.40 $^{{\rm f}}$ -0.42 $^{{\rm f}}$ a Under-estimates 13 $\mu$ m

7 1.20(27) 1.62(37) 0.74(3) -0.08(1) 191(9) 86(6) 18(3) 0(0) 95(4) -0.18 $^{{\rm f}}$ -0.37 $^{{\rm f}}$ a Possible 10.5 $\mu$ m emission,

under-estimates 13 $\mu$ m

$\rho$ Oph A 1 0.42(2) 0.85(4) 2.11(11) -0.27(4) 27(3) 72(7) 19(3) 927(94) 57(3) -0.70 -0.20 a Poor 5-8 $\mu$ m fit

2 0.21(2) 0.54(6) 2.68(19) -0.70(10) 207(14) 253(53) 79(9) 2611(319) 0(0) 0.34 1.36 a Definite 14 $\mu$ m band

3 6.03(7) 8.99(10) 1.05(4) -0.20(3) 107(6) $^{{\rm c}}$ 0(0) $^{{\rm c}}$ ?? 0(0) $^{{\rm c}}$ 10(3) 87(3) 1.61 1.84 a Possible 7.1 $\mu$ m band

4 $^{{\rm e}}$ 2.33(3) 2.74(4) 0.49(2) -0.16(2) 0(0) 25(12) 27(4) 687(69) 23(1) 0.95 1.15 b Silicate fit too wide

$\rho$ Oph E 1 2.88(3) 3.36(4) 0.52(2) -0.21(3) 140(5) 60(4) 27(4) 1206(121) 98(4) 0.15 0.43 b Silicate too wide

2 0.23(2) 0.56(5) 2.55(12) -0.36(5) 255(16) 93(7) 53(8) 1881(196) 324(20) -0.26 $^{{\rm f}}$ 0.51 $^{{\rm f}}$ a Deep 7.6 $\mu$ m band

3 0.34(38) 0.65(72) 1.84(12) -0.27(4) 131(10) 134(13) 15(2) 1536(160) 155(7) -0.06 0.47 a Very deep 6.8 $\mu$ m band

4 0.10(2) 0.17(4) 1.42(8) -0.23(4) 291(41) $^{{\rm c}}$ 0(0) $^{{\rm c}}$ 29(5) $^{{\rm c}}$ 1561(279) 501(49) -0.55 $^{{\rm f}}$ -0.01 $^{{\rm f}}$ a Very noisy: probably only

class, CO₂, $\tau_{{\rm Si}}$ good data

5 2.62(4) 5.89(9) 2.22(8) -0.29(4) 218(14) 105(7) 20(3) 339(34) 207(8) 1.17 1.59 a

6 4.60(25) 16.10(89) 3.31(13) -0.52(7) 306(12) 117(7) 0(0) 193(20) 112(4) 1.54 2.17 a

Ser A 1 0.06(1) 0.15(3) 2.14(31) -0.60(9) 845(849) $^{{\rm c}}$ 356(161) $^{{\rm c}}$ 0(0) $^{{\rm c}}$ 2386(311) 298(33)? -0.24 0.47 a Noisy and faint, possible

12, 14 $\mu$ m bands

2 0.06(1) 0.17(3) 2.39(61) -0.76(10) 965(878) $^{{\rm c}}$ 298(130) $^{{\rm c}}$ 0(0) $^{{\rm c}}$ 2679(437) 0(0) 0.43 1.35 a Noisy, possible absorption

bands at 11-16 $\mu$ m

3 0.64(2) 1.24(4) 1.70(7) -0.32(4) 523(20) 165(11) 19(3) 1633(163) 285(13) 1.35 1.91 a Possible narrow absorption

band at 9.7 $\mu$ m - CH₃OH?

4 0.07(1) 0.15(2) 2.14(34) -0.46(7) 847(688) $^{{\rm c}}$ 271(69) $^{{\rm c}}$ 0(0) $^{{\rm c}}$ 2426(552) 269(51)? 0.42 1.17 a Noisy, possible absorption

bands at 11-16 $\mu$ m

5 0.17(1) 0.30(2) 1.42(12) -0.37(5) 435(26) 165(11) 8(1) 1538(177) 186(11) 0.25 0.71 a Possible 12, 14 $\mu$ m bands

6 0.46(1) 0.45(1) -0.18(1) -0.22(3) 272(17) 97(6) 0(0) 803(80) 223(9) 0.44 0.50 b Strong 11 $\mu$ m emission

7 - - - - 954(312) $^{{\rm d}}$ - - - 504(59) - - a

$^{{\rm a}}$ Values of $\tau_{{\rm Si}}$ between -0.8 and 0.6 are considered to be questionable, due to the presence of significant silicate emission and absorption (see discussion in Sect. 3.2.5).

$^{{\rm b}}$ Classification scheme proposed in Sect. 3.2.5.

$^{{\rm c}}$ Short wavelength features fitted using linear continuum, fitted from 5.6-7.9 $\mu$ m, in cases where the automatic fitting procedure produced errors (see Sect. 2.5).

$^{{\rm d}}$ Feature fitted manually as spectrum was incomplete.

$^{{\rm e}}$ Source fell on bad column on array: data from these sources is not considered to be especially accurate.

$^{{\rm f}}$ No K-band data: $\alpha$ evaluated using $\lambda_1=8.0$ $\mu$ m.

**Table 2:** Fitting results: errors are given in parentheses (i.e. 7.84(16) $\leftrightarrow$ 7.84 $\pm$ 0.16); source names correspond to those in Table 1.
	8 $\mu$ m	8 $\mu$ m			Equivalent Line Widths (nm)	Source	Cont.
Source	flux	continuum	$\tau_{{\rm Si}}$ $^{{\rm a}}$	$\tau_{11~ \mu {\rm m}}$	6 $\mu$ m	6.8 $\mu$ m	7.6 $\mu$ m	13 $\mu$ m	15.2 $\mu$ m	$\alpha$	$\alpha$	Group $^{{\rm b}}$	Notes
	(Jy)	flux (Jy)			H₂O		CH₄??	H₂O	CO₂
RCrA 1	7.84(16)	7.79(16)	-0.02(1)	-0.06(1)	178(8) $^{{\rm c}}$	17(1) $^{{\rm c}}$	17(3) $^{{\rm c}}$	247(25)	168(7)	0.56	0.58	b	Strong 11 $\mu$ m emission
2	0.95(2)	1.24(3)	0.72(3)	-0.27(4)	203(8)	57(4)	17(3)	0(0)	83(4)	-0.96 $^{{\rm f}}$	-1.35 $^{{\rm f}}$	a	Silicate too wide at long
													$\lambda$ , probable 13 $\mu$ m error
3	0.27(2)	0.28(2)	0.22(1)	-0.16(2)	147(15) $^{{\rm c}}$	14(3) $^{{\rm c}}$	0(0) $^{{\rm c}}$	718(76)	0(0)	-1.11	-0.96	b	$\tau_{{\rm Si}}$ probably too small,
													possible absorption bands
													at 13 $\mu$ m, 14.25 $\mu$ m
4	1.74(110)	2.28(144)	0.71(3)	-0.07(1)	271(10)	81(6)	6(1)	586(59)	253(11)	1.23	1.43	a	Possible 10.5 $\mu$ m emission
5	22.46(44)	36.91(74)	1.35(5)	-0.23(3)	206(8)	67(4)	14(2)	1535(155)	129(5)	1.30	1.79	a
6	0.94(3)	1.36(4)	0.95(4)	-0.15(2)	204(7)	61(4)	11(2)	73(7)	97(4)	-0.40 $^{{\rm f}}$	-0.42 $^{{\rm f}}$	a	Under-estimates 13 $\mu$ m
7	1.20(27)	1.62(37)	0.74(3)	-0.08(1)	191(9)	86(6)	18(3)	0(0)	95(4)	-0.18 $^{{\rm f}}$	-0.37 $^{{\rm f}}$	a	Possible 10.5 $\mu$ m emission,
													under-estimates 13 $\mu$ m
$\rho$ Oph A 1	0.42(2)	0.85(4)	2.11(11)	-0.27(4)	27(3)	72(7)	19(3)	927(94)	57(3)	-0.70	-0.20	a	Poor 5-8 $\mu$ m fit
2	0.21(2)	0.54(6)	2.68(19)	-0.70(10)	207(14)	253(53)	79(9)	2611(319)	0(0)	0.34	1.36	a	Definite 14 $\mu$ m band
3	6.03(7)	8.99(10)	1.05(4)	-0.20(3)	107(6) $^{{\rm c}}$	0(0) $^{{\rm c}}$ ??	0(0) $^{{\rm c}}$	10(3)	87(3)	1.61	1.84	a	Possible 7.1 $\mu$ m band
4 $^{{\rm e}}$	2.33(3)	2.74(4)	0.49(2)	-0.16(2)	0(0)	25(12)	27(4)	687(69)	23(1)	0.95	1.15	b	Silicate fit too wide
$\rho$ Oph E 1	2.88(3)	3.36(4)	0.52(2)	-0.21(3)	140(5)	60(4)	27(4)	1206(121)	98(4)	0.15	0.43	b	Silicate too wide
2	0.23(2)	0.56(5)	2.55(12)	-0.36(5)	255(16)	93(7)	53(8)	1881(196)	324(20)	-0.26 $^{{\rm f}}$	0.51 $^{{\rm f}}$	a	Deep 7.6 $\mu$ m band
3	0.34(38)	0.65(72)	1.84(12)	-0.27(4)	131(10)	134(13)	15(2)	1536(160)	155(7)	-0.06	0.47	a	Very deep 6.8 $\mu$ m band
4	0.10(2)	0.17(4)	1.42(8)	-0.23(4)	291(41) $^{{\rm c}}$	0(0) $^{{\rm c}}$	29(5) $^{{\rm c}}$	1561(279)	501(49)	-0.55 $^{{\rm f}}$	-0.01 $^{{\rm f}}$	a	Very noisy: probably only
													class, CO₂, $\tau_{{\rm Si}}$ good data
5	2.62(4)	5.89(9)	2.22(8)	-0.29(4)	218(14)	105(7)	20(3)	339(34)	207(8)	1.17	1.59	a
6	4.60(25)	16.10(89)	3.31(13)	-0.52(7)	306(12)	117(7)	0(0)	193(20)	112(4)	1.54	2.17	a
Ser A 1	0.06(1)	0.15(3)	2.14(31)	-0.60(9)	845(849) $^{{\rm c}}$	356(161) $^{{\rm c}}$	0(0) $^{{\rm c}}$	2386(311)	298(33)?	-0.24	0.47	a	Noisy and faint, possible
													12, 14 $\mu$ m bands
2	0.06(1)	0.17(3)	2.39(61)	-0.76(10)	965(878) $^{{\rm c}}$	298(130) $^{{\rm c}}$	0(0) $^{{\rm c}}$	2679(437)	0(0)	0.43	1.35	a	Noisy, possible absorption
													bands at 11-16 $\mu$ m
3	0.64(2)	1.24(4)	1.70(7)	-0.32(4)	523(20)	165(11)	19(3)	1633(163)	285(13)	1.35	1.91	a	Possible narrow absorption
													band at 9.7 $\mu$ m - CH₃OH?
4	0.07(1)	0.15(2)	2.14(34)	-0.46(7)	847(688) $^{{\rm c}}$	271(69) $^{{\rm c}}$	0(0) $^{{\rm c}}$	2426(552)	269(51)?	0.42	1.17	a	Noisy, possible absorption
													bands at 11-16 $\mu$ m
5	0.17(1)	0.30(2)	1.42(12)	-0.37(5)	435(26)	165(11)	8(1)	1538(177)	186(11)	0.25	0.71	a	Possible 12, 14 $\mu$ m bands
6	0.46(1)	0.45(1)	-0.18(1)	-0.22(3)	272(17)	97(6)	0(0)	803(80)	223(9)	0.44	0.50	b	Strong 11 $\mu$ m emission
7	-	-	-	-	954(312) $^{{\rm d}}$	-	-	-	504(59)	-	-	a

Table 2: continued.
8 $\mu$ m 8 $\mu$ m Equivalent Line Widths (nm) Source Cont.

Source flux continuum $\tau_{{\rm Si}}$ $^{{\rm a}}$ $\tau_{11~ \mu {\rm m}}$ 6 $\mu$ m 6.8 $\mu$ m 7.6 $\mu$ m 13 $\mu$ m 15.2 $\mu$ m $\alpha$ $\alpha$ Group $^{{\rm b}}$ Notes

(Jy) flux (Jy) H₂O CH₄?? H₂O CO₂

Ser B 1 0.19(1) 0.57(3) 2.76(16) -0.39(5) 703(44) 215(31) 0(0) 962(99) 267(14) 2.02 2.63 a Very deep absorption features

2 0.19(1) 0.16(1) -0.41(2) -0.23(3) 91(5) $^{{\rm c}}$ 39(3) $^{{\rm c}}$ 25(4) $^{{\rm c}}$ 0(0) 67(10) 0.14 0.04 b Large discontinuity at join,

poor fit from 8-12 $\mu$ m

3 1.37(2) 0.77(2) -1.51(5) -0.10(1) 208(16) $^{{\rm c}}$ 33(2) $^{{\rm c}}$ 43(6) $^{{\rm c}}$ 1198(121) 202(8) 1.14 1.05 c Strong silicate emission,

fit too narrow

4 0.33(1) 0.28(1) -0.37(1) -0.19(3) 154(9) $^{{\rm c}}$ 45(4) $^{{\rm c}}$ 32(5) $^{{\rm c}}$ 0(0) 102(5) -1.03 $^{{\rm f}}$ -1.14 $^{{\rm f}}$ b Poss. 13 $\mu$ m absorption band

5 0.10(1) 0.08(1) -0.57(3) -0.22(3) 208(8) 57(4) 29(4) 0(0) 59(4) 0.06 -0.09 b Long $\lambda$ fit probably wrong

6 6.16(14) 5.31(13) -0.33(1) -0.12(2) 137(5) $^{{\rm c}}$ 38(2) $^{{\rm c}}$ 24(4) $^{{\rm c}}$ 0(0) 103(4) -0.11 -0.18 b Poor 8-11 $\mu$ m fit

7 0.35(1) 0.32(1) -0.14(1) -0.15(2) 152(7) $^{{\rm c}}$ 50(4) $^{{\rm c}}$ 23(3) $^{{\rm c}}$ 0(0) 100(4) -1.13 $^{{\rm f}}$ -1.10 $^{{\rm f}}$ b Large discontinuity at join

8 $^{{\rm e}}$ 0.31(1) 0.27(1) -0.36(1) -0.11(1) 62(4) 0(0) 1(1) 554(56) 27(3) -0.31 -0.29 b

9 0.35(1) 0.53(2) 1.02(4) -0.20(3) 237(8) 38(4) 25(4) 1119(114) 144(6) 0.99 1.33 a Dubious 6.8 $\mu$ m and 7.5 $\mu$ m fits

10 0.36(1) 0.33(1) 0.04(1) -0.06(1) 168(11) $^{{\rm c}}$ 35(3) $^{{\rm c}}$ 23(3) $^{{\rm c}}$ 609(61) 126(6) -0.43 -0.34 b Probably peak in nebulosity

11 0.36(2) 1.89(10) 4.34(31) -0.62(8) 984(45) 350(67) 73(11) 1996(202) 479(28) 2.07 3.14 a Very deep absorption features

12 $^{{\rm e}}$ - - - - 414(76) $^{{\rm c}}$ ? 0(0) $^{{\rm c}}$ ? 19(5) $^{{\rm c}}$ ? - 143(16)? - - - Very dubious measurements:

peaks on bad column

13 0.04(1) 0.07(2) 1.35(22) -0.20(3) 348(51) $^{{\rm c}}$ 146(46) $^{{\rm c}}$ 69(11) $^{{\rm c}}$ 2496(291) 185(7) 0.55 1.09 a Good fit but very faint

Cha I 1 $^{{\rm e}}$ 0.71(2) 0.65(2) -0.18(1) -0.07(1) 0(0) 0(0) 7(1) 548(55) 0(0) -0.32 -0.28 b Poor fit, due to large

discontinuity at join

2 - - - - - - - - 150(6) 1.81 - a

3 0.14(1) 0.13(1) -0.37(2) -0.07(1) 144(10) $^{{\rm c}}$ 36(3) $^{{\rm c}}$ 10(2) $^{{\rm c}}$ 0(0) 0(0) -0.40 -0.52 b Noisy, poor fit at long $\lambda$

4 0.04(1) 0.02(1) -1.88(11) 0.13(2) 225(25) $^{{\rm c}}$ 87(9) $^{{\rm c}}$ 0(0) $^{{\rm c}}$ 0(0) 0(0) -0.65 -1.09 c Very faint, low S/N

5 3.58(6) 3.59(6) 0.00(1) -0.12(2) 41(2) $^{{\rm c}}$ 0(0) $^{{\rm c}}$ 7(1) $^{{\rm c}}$ 283(28) 0(0) -0.43 -0.37 b Strong 11 $\mu$ m emission

6 3.18(6) 1.93(4) -1.32(5) -0.04(1) 0(0) 0(0) 0(0) 0(0) 0(0) -0.85 -1.07 c Silicate fit too narrow

$^{{\rm a}}$ ] Values of $\tau_{{\rm Si}}$ between -0.8 and 0.6 are considered to be questionable, due to the presence of significant silicate emission and absorption (see discussion in Sect. 3.2.5).

$^{{\rm b}}$ ] Classification scheme proposed in Sect. 3.2.5.

$^{{\rm c}}$ ] Short wavelength features fitted using linear continuum, fitted from 5.6-7.9 $\mu$ m, in cases where the automatic fitting procedure produced errors (see Sect. 2.5).

$^{{\rm d}}$ ] Feature fitted manually as spectrum was incomplete.

$^{{\rm e}}$ ] Source fell on bad column on array: data from these sources is not considered to be especially accurate.

$^{{\rm f}}$ ] No K-band data: $\alpha$ evaluated using $\lambda_1=8.0$ $\mu$ m.

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