Table A.2: Comparison between various model runs for neutral anthracene (C₁₄H₁₀), using either the experimental ( $\sigma _{\rm lab}$ , Joblin et al. 1992; Joblin 1992) or the theoretical ( $\sigma _{\rm th}$ , Malloci et al. 2004) photo-absorption spectrum, in different RFs. Bands which are electric-dipole forbidden are enclosed in square brackets in the first column. In each of the other columns, we list the absolute flux emitted by one molecule in a given band and RF and, in parentheses, the flux fraction in that band. Bands whose calculated flux fraction in the ISRF is less than 0.05% are omitted.
Integrated flux

ISRF Red Rectangle IRAS 21282+5050

Peak $\sigma _{\rm lab}$ $\sigma _{\rm th}$ $\sigma _{\rm lab}$ $\sigma _{\rm th}$ $\sigma _{\rm lab}$ $\sigma _{\rm th}$

( $\mu$ m) (W sr^-1) (%) (W sr^-1) (%) (W sr^-1) (%) (W sr^-1) (%) (W sr^-1) (%) (W sr^-1) (%)

3.25 $1.2 \times 10^{-27}$ (27.06) $1.1 \times 10^{-27}$ (25.74) $1.6 \times 10^{-26}$ (22.93) $2.4 \times 10^{-26}$ (19.41) $1.2 \times 10^{-22}$ (29.33) $9.9 \times 10^{-23}$ (28.65)

3.26 $7.5 \times 10^{-28}$ (17.55) $7.0 \times 10^{-28}$ (16.69) $1.1 \times 10^{-26}$ (15.09) $1.6 \times 10^{-26}$ (12.80) $7.6 \times 10^{-23}$ (18.96) $6.5 \times 10^{-23}$ (18.89)

3.28 $2.4 \times 10^{-30}$ (0.06) $2.3 \times 10^{-30}$ (0.05) $3.4 \times 10^{-29}$ (0.05) $5.1 \times 10^{-29}$ (0.04) $2.2 \times 10^{-25}$ (0.05) $2.1 \times 10^{-25}$ (0.06)

3.28 $2.0 \times 10^{-28}$ (4.56) $1.8 \times 10^{-28}$ (4.41) $2.9 \times 10^{-27}$ (3.97) $4.3 \times 10^{-27}$ (3.41) $2.0 \times 10^{-23}$ (4.89) $1.7 \times 10^{-23}$ (4.95)

3.29 $1.1 \times 10^{-28}$ (2.53) $1.0 \times 10^{-28}$ (2.43) $1.6 \times 10^{-27}$ (2.17) $2.3 \times 10^{-27}$ (1.84) $1.1 \times 10^{-23}$ (2.78) $9.2 \times 10^{-24}$ (2.68)

6.16 $1.4 \times 10^{-28}$ (3.22) $1.3 \times 10^{-28}$ (3.23) $2.4 \times 10^{-27}$ (3.37) $4.2 \times 10^{-27}$ (3.39) $1.3 \times 10^{-23}$ (3.13) $1.1 \times 10^{-23}$ (3.18)

6.51 $3.9 \times 10^{-29}$ (0.92) $3.9 \times 10^{-29}$ (0.93) $6.9 \times 10^{-28}$ (0.96) $1.3 \times 10^{-27}$ (1.02) $3.7 \times 10^{-24}$ (0.91) $3.1 \times 10^{-24}$ (0.89)

6.86 $7.8 \times 10^{-29}$ (1.82) $7.6 \times 10^{-29}$ (1.81) $1.4 \times 10^{-27}$ (1.88) $2.5 \times 10^{-27}$ (2.03) $7.0 \times 10^{-24}$ (1.74) $6.1 \times 10^{-24}$ (1.75)

6.86 $3.6 \times 10^{-29}$ (0.83) $3.6 \times 10^{-29}$ (0.85) $6.6 \times 10^{-28}$ (0.92) $1.2 \times 10^{-27}$ (0.96) $3.2 \times 10^{-24}$ (0.79) $2.9 \times 10^{-24}$ (0.83)

7.22 $2.7 \times 10^{-30}$ (0.06) $2.7 \times 10^{-30}$ (0.06) $5.8 \times 10^{-29}$ (0.08) $9.1 \times 10^{-29}$ (0.07) $2.8 \times 10^{-25}$ (0.07) $2.0 \times 10^{-25}$ (0.06)

7.43 $4.7 \times 10^{-29}$ (1.10) $4.7 \times 10^{-29}$ (1.13) $9.0 \times 10^{-28}$ (1.25) $1.7 \times 10^{-27}$ (1.33) $4.4 \times 10^{-24}$ (1.10) $3.8 \times 10^{-24}$ (1.09)

7.60 $7.8 \times 10^{-29}$ (1.83) $7.8 \times 10^{-29}$ (1.86) $1.5 \times 10^{-27}$ (2.04) $2.7 \times 10^{-27}$ (2.13) $6.9 \times 10^{-24}$ (1.71) $6.1 \times 10^{-24}$ (1.78)

7.85 $9.8 \times 10^{-29}$ (2.29) $9.9 \times 10^{-29}$ (2.37) $1.8 \times 10^{-27}$ (2.53) $3.5 \times 10^{-27}$ (2.76) $8.8 \times 10^{-24}$ (2.20) $7.7 \times 10^{-24}$ (2.24)

8.55 $1.3 \times 10^{-29}$ (0.31) $1.4 \times 10^{-29}$ (0.33) $2.5 \times 10^{-28}$ (0.35) $4.9 \times 10^{-28}$ (0.39) $1.2 \times 10^{-24}$ (0.30) $1.0 \times 10^{-24}$ (0.30)

8.62 $3.4 \times 10^{-29}$ (0.80) $3.4 \times 10^{-29}$ (0.82) $6.5 \times 10^{-28}$ (0.91) $1.2 \times 10^{-27}$ (1.00) $3.1 \times 10^{-24}$ (0.76) $2.7 \times 10^{-24}$ (0.79)

8.67 $9.0 \times 10^{-29}$ (2.11) $9.2 \times 10^{-29}$ (2.19) $1.7 \times 10^{-27}$ (2.39) $3.2 \times 10^{-27}$ (2.58) $8.1 \times 10^{-24}$ (2.01) $6.9 \times 10^{-24}$ (2.01)

9.95 $4.2 \times 10^{-29}$ (0.98) $4.2 \times 10^{-29}$ (1.01) $8.1 \times 10^{-28}$ (1.13) $1.6 \times 10^{-27}$ (1.24) $3.8 \times 10^{-24}$ (0.94) $3.2 \times 10^{-24}$ (0.94)

10.41 $7.4 \times 10^{-29}$ (1.73) $7.5 \times 10^{-29}$ (1.80) $1.5 \times 10^{-27}$ (2.02) $2.8 \times 10^{-27}$ (2.22) $6.7 \times 10^{-24}$ (1.66) $5.7 \times 10^{-24}$ (1.66)

11.00 $1.6 \times 10^{-29}$ (0.36) $1.7 \times 10^{-29}$ (0.41) $3.1 \times 10^{-28}$ (0.43) $6.2 \times 10^{-28}$ (0.50) $1.4 \times 10^{-24}$ (0.35) $1.2 \times 10^{-24}$ (0.34)

11.32 $5.4 \times 10^{-28}$ (12.60) $5.5 \times 10^{-28}$ (13.25) $1.1 \times 10^{-26}$ (14.72) $2.1 \times 10^{-26}$ (16.66) $4.8 \times 10^{-23}$ (11.92) $4.2 \times 10^{-23}$ (12.14)

13.71 $5.3 \times 10^{-28}$ (12.29) $5.5 \times 10^{-28}$ (13.12) $1.1 \times 10^{-26}$ (14.64) $2.1 \times 10^{-26}$ (16.85) $4.6 \times 10^{-23}$ (11.49) $4.1 \times 10^{-23}$ (11.77)

15.33 $9.2 \times 10^{-30}$ (0.21) $9.6 \times 10^{-30}$ (0.23) $2.1 \times 10^{-28}$ (0.29) $3.9 \times 10^{-28}$ (0.31) $7.9 \times 10^{-25}$ (0.20) $7.0 \times 10^{-25}$ (0.20)

[15.71] $1.7 \times 10^{-30}$ (0.04) $2.2 \times 10^{-30}$ (0.05) $4.1 \times 10^{-29}$ (0.06) $9.9 \times 10^{-29}$ (0.08) - -

16.34 $4.2 \times 10^{-29}$ (0.99) $4.4 \times 10^{-29}$ (1.04) $8.5 \times 10^{-28}$ (1.18) $1.7 \times 10^{-27}$ (1.36) $3.6 \times 10^{-24}$ (0.90) $3.2 \times 10^{-24}$ (0.93)

[17.11] $2.3 \times 10^{-30}$ (0.05) $2.6 \times 10^{-30}$ (0.06) $5.0 \times 10^{-29}$ (0.07) $1.1 \times 10^{-28}$ (0.09) - -

[18.71] $2.8 \times 10^{-30}$ (0.06) $3.3 \times 10^{-30}$ (0.08) $6.4 \times 10^{-29}$ (0.09) $1.4 \times 10^{-28}$ (0.11) - -

[20.04] $3.4 \times 10^{-30}$ (0.08) $3.6 \times 10^{-30}$ (0.09) $7.3 \times 10^{-29}$ (0.10) $1.6 \times 10^{-28}$ (0.13) - -

[21.02] $3.4 \times 10^{-30}$ (0.08) $3.9 \times 10^{-30}$ (0.09) $8.1 \times 10^{-29}$ (0.11) $1.8 \times 10^{-28}$ (0.14) - -

21.26 $7.3 \times 10^{-29}$ (1.71) $7.7 \times 10^{-29}$ (1.85) $1.5 \times 10^{-27}$ (2.09) $3.1 \times 10^{-27}$ (2.49) $6.3 \times 10^{-24}$ (1.56) $5.6 \times 10^{-24}$ (1.61)

[25.45] $5.0 \times 10^{-30}$ (0.12) $5.5 \times 10^{-30}$ (0.13) $1.0 \times 10^{-28}$ (0.14) $2.2 \times 10^{-28}$ (0.18) - -

[25.62] $4.7 \times 10^{-30}$ (0.11) $5.4 \times 10^{-30}$ (0.13) $1.1 \times 10^{-28}$ (0.15) $2.3 \times 10^{-28}$ (0.18) - -

26.35 $5.3 \times 10^{-30}$ (0.12) $5.9 \times 10^{-30}$ (0.14) $1.1 \times 10^{-28}$ (0.16) $2.6 \times 10^{-28}$ (0.21) $6 \times 10^{-26}$ (0.02) $6.5 \times 10^{-26}$ (0.02)

[37.41] $7.4 \times 10^{-30}$ (0.17) $8.2 \times 10^{-30}$ (0.20) $1.5 \times 10^{-28}$ (0.20) $3.2 \times 10^{-28}$ (0.26) - -

[43.01] $8.5 \times 10^{-30}$ (0.20) $8.8 \times 10^{-30}$ (0.21) $1.7 \times 10^{-28}$ (0.23) $3.4 \times 10^{-28}$ (0.27) - -

43.68 $1.1 \times 10^{-29}$ (0.26) $1.2 \times 10^{-29}$ (0.29) $2.4 \times 10^{-28}$ (0.33) $5.3 \times 10^{-28}$ (0.43) $6.7 \times 10^{-25}$ (0.17) $6.1 \times 10^{-25}$ (0.18)

[82.09] $1.1 \times 10^{-29}$ (0.25) $1.3 \times 10^{-29}$ (0.30) $1.8 \times 10^{-28}$ (0.25) $3.0 \times 10^{-28}$ (0.24) - -

110.23 $1.3 \times 10^{-29}$ (0.30) $1.4 \times 10^{-29}$ (0.33) $2.8 \times 10^{-28}$ (0.39) $6.4 \times 10^{-28}$ (0.51) $1.8 \times 10^{-25}$ (0.04) $1.8 \times 10^{-25}$ (0.05)

**Table A.2:** Comparison between various model runs for neutral anthracene (C₁₄H₁₀), using either the experimental ( $\sigma _{\rm lab}$ , Joblin et al. 1992; Joblin 1992) or the theoretical ( $\sigma _{\rm th}$ , Malloci et al. 2004) photo-absorption spectrum, in different RFs. Bands which are electric-dipole forbidden are enclosed in square brackets in the first column. In each of the other columns, we list the absolute flux emitted by one molecule in a given band and RF and, in parentheses, the flux fraction in that band. Bands whose calculated flux fraction in the ISRF is less than 0.05% are omitted.
	Integrated flux
	ISRF	Red Rectangle	IRAS 21282+5050
Peak	$\sigma _{\rm lab}$	$\sigma _{\rm th}$	$\sigma _{\rm lab}$	$\sigma _{\rm th}$	$\sigma _{\rm lab}$	$\sigma _{\rm th}$
( $\mu$ m)	(W sr^-1) (%)	(W sr^-1) (%)	(W sr^-1) (%)	(W sr^-1) (%)	(W sr^-1) (%)	(W sr^-1) (%)
3.25	$1.2 \times 10^{-27}$ (27.06)	$1.1 \times 10^{-27}$ (25.74)	$1.6 \times 10^{-26}$ (22.93)	$2.4 \times 10^{-26}$ (19.41)	$1.2 \times 10^{-22}$ (29.33)	$9.9 \times 10^{-23}$ (28.65)
3.26	$7.5 \times 10^{-28}$ (17.55)	$7.0 \times 10^{-28}$ (16.69)	$1.1 \times 10^{-26}$ (15.09)	$1.6 \times 10^{-26}$ (12.80)	$7.6 \times 10^{-23}$ (18.96)	$6.5 \times 10^{-23}$ (18.89)
3.28	$2.4 \times 10^{-30}$ (0.06)	$2.3 \times 10^{-30}$ (0.05)	$3.4 \times 10^{-29}$ (0.05)	$5.1 \times 10^{-29}$ (0.04)	$2.2 \times 10^{-25}$ (0.05)	$2.1 \times 10^{-25}$ (0.06)
3.28	$2.0 \times 10^{-28}$ (4.56)	$1.8 \times 10^{-28}$ (4.41)	$2.9 \times 10^{-27}$ (3.97)	$4.3 \times 10^{-27}$ (3.41)	$2.0 \times 10^{-23}$ (4.89)	$1.7 \times 10^{-23}$ (4.95)
3.29	$1.1 \times 10^{-28}$ (2.53)	$1.0 \times 10^{-28}$ (2.43)	$1.6 \times 10^{-27}$ (2.17)	$2.3 \times 10^{-27}$ (1.84)	$1.1 \times 10^{-23}$ (2.78)	$9.2 \times 10^{-24}$ (2.68)
6.16	$1.4 \times 10^{-28}$ (3.22)	$1.3 \times 10^{-28}$ (3.23)	$2.4 \times 10^{-27}$ (3.37)	$4.2 \times 10^{-27}$ (3.39)	$1.3 \times 10^{-23}$ (3.13)	$1.1 \times 10^{-23}$ (3.18)
6.51	$3.9 \times 10^{-29}$ (0.92)	$3.9 \times 10^{-29}$ (0.93)	$6.9 \times 10^{-28}$ (0.96)	$1.3 \times 10^{-27}$ (1.02)	$3.7 \times 10^{-24}$ (0.91)	$3.1 \times 10^{-24}$ (0.89)
6.86	$7.8 \times 10^{-29}$ (1.82)	$7.6 \times 10^{-29}$ (1.81)	$1.4 \times 10^{-27}$ (1.88)	$2.5 \times 10^{-27}$ (2.03)	$7.0 \times 10^{-24}$ (1.74)	$6.1 \times 10^{-24}$ (1.75)
6.86	$3.6 \times 10^{-29}$ (0.83)	$3.6 \times 10^{-29}$ (0.85)	$6.6 \times 10^{-28}$ (0.92)	$1.2 \times 10^{-27}$ (0.96)	$3.2 \times 10^{-24}$ (0.79)	$2.9 \times 10^{-24}$ (0.83)
7.22	$2.7 \times 10^{-30}$ (0.06)	$2.7 \times 10^{-30}$ (0.06)	$5.8 \times 10^{-29}$ (0.08)	$9.1 \times 10^{-29}$ (0.07)	$2.8 \times 10^{-25}$ (0.07)	$2.0 \times 10^{-25}$ (0.06)
7.43	$4.7 \times 10^{-29}$ (1.10)	$4.7 \times 10^{-29}$ (1.13)	$9.0 \times 10^{-28}$ (1.25)	$1.7 \times 10^{-27}$ (1.33)	$4.4 \times 10^{-24}$ (1.10)	$3.8 \times 10^{-24}$ (1.09)
7.60	$7.8 \times 10^{-29}$ (1.83)	$7.8 \times 10^{-29}$ (1.86)	$1.5 \times 10^{-27}$ (2.04)	$2.7 \times 10^{-27}$ (2.13)	$6.9 \times 10^{-24}$ (1.71)	$6.1 \times 10^{-24}$ (1.78)
7.85	$9.8 \times 10^{-29}$ (2.29)	$9.9 \times 10^{-29}$ (2.37)	$1.8 \times 10^{-27}$ (2.53)	$3.5 \times 10^{-27}$ (2.76)	$8.8 \times 10^{-24}$ (2.20)	$7.7 \times 10^{-24}$ (2.24)
8.55	$1.3 \times 10^{-29}$ (0.31)	$1.4 \times 10^{-29}$ (0.33)	$2.5 \times 10^{-28}$ (0.35)	$4.9 \times 10^{-28}$ (0.39)	$1.2 \times 10^{-24}$ (0.30)	$1.0 \times 10^{-24}$ (0.30)
8.62	$3.4 \times 10^{-29}$ (0.80)	$3.4 \times 10^{-29}$ (0.82)	$6.5 \times 10^{-28}$ (0.91)	$1.2 \times 10^{-27}$ (1.00)	$3.1 \times 10^{-24}$ (0.76)	$2.7 \times 10^{-24}$ (0.79)
8.67	$9.0 \times 10^{-29}$ (2.11)	$9.2 \times 10^{-29}$ (2.19)	$1.7 \times 10^{-27}$ (2.39)	$3.2 \times 10^{-27}$ (2.58)	$8.1 \times 10^{-24}$ (2.01)	$6.9 \times 10^{-24}$ (2.01)
9.95	$4.2 \times 10^{-29}$ (0.98)	$4.2 \times 10^{-29}$ (1.01)	$8.1 \times 10^{-28}$ (1.13)	$1.6 \times 10^{-27}$ (1.24)	$3.8 \times 10^{-24}$ (0.94)	$3.2 \times 10^{-24}$ (0.94)
10.41	$7.4 \times 10^{-29}$ (1.73)	$7.5 \times 10^{-29}$ (1.80)	$1.5 \times 10^{-27}$ (2.02)	$2.8 \times 10^{-27}$ (2.22)	$6.7 \times 10^{-24}$ (1.66)	$5.7 \times 10^{-24}$ (1.66)
11.00	$1.6 \times 10^{-29}$ (0.36)	$1.7 \times 10^{-29}$ (0.41)	$3.1 \times 10^{-28}$ (0.43)	$6.2 \times 10^{-28}$ (0.50)	$1.4 \times 10^{-24}$ (0.35)	$1.2 \times 10^{-24}$ (0.34)
11.32	$5.4 \times 10^{-28}$ (12.60)	$5.5 \times 10^{-28}$ (13.25)	$1.1 \times 10^{-26}$ (14.72)	$2.1 \times 10^{-26}$ (16.66)	$4.8 \times 10^{-23}$ (11.92)	$4.2 \times 10^{-23}$ (12.14)
13.71	$5.3 \times 10^{-28}$ (12.29)	$5.5 \times 10^{-28}$ (13.12)	$1.1 \times 10^{-26}$ (14.64)	$2.1 \times 10^{-26}$ (16.85)	$4.6 \times 10^{-23}$ (11.49)	$4.1 \times 10^{-23}$ (11.77)
15.33	$9.2 \times 10^{-30}$ (0.21)	$9.6 \times 10^{-30}$ (0.23)	$2.1 \times 10^{-28}$ (0.29)	$3.9 \times 10^{-28}$ (0.31)	$7.9 \times 10^{-25}$ (0.20)	$7.0 \times 10^{-25}$ (0.20)
[15.71]	$1.7 \times 10^{-30}$ (0.04)	$2.2 \times 10^{-30}$ (0.05)	$4.1 \times 10^{-29}$ (0.06)	$9.9 \times 10^{-29}$ (0.08)	-	-
16.34	$4.2 \times 10^{-29}$ (0.99)	$4.4 \times 10^{-29}$ (1.04)	$8.5 \times 10^{-28}$ (1.18)	$1.7 \times 10^{-27}$ (1.36)	$3.6 \times 10^{-24}$ (0.90)	$3.2 \times 10^{-24}$ (0.93)
[17.11]	$2.3 \times 10^{-30}$ (0.05)	$2.6 \times 10^{-30}$ (0.06)	$5.0 \times 10^{-29}$ (0.07)	$1.1 \times 10^{-28}$ (0.09)	-	-
[18.71]	$2.8 \times 10^{-30}$ (0.06)	$3.3 \times 10^{-30}$ (0.08)	$6.4 \times 10^{-29}$ (0.09)	$1.4 \times 10^{-28}$ (0.11)	-	-
[20.04]	$3.4 \times 10^{-30}$ (0.08)	$3.6 \times 10^{-30}$ (0.09)	$7.3 \times 10^{-29}$ (0.10)	$1.6 \times 10^{-28}$ (0.13)	-	-
[21.02]	$3.4 \times 10^{-30}$ (0.08)	$3.9 \times 10^{-30}$ (0.09)	$8.1 \times 10^{-29}$ (0.11)	$1.8 \times 10^{-28}$ (0.14)	-	-
21.26	$7.3 \times 10^{-29}$ (1.71)	$7.7 \times 10^{-29}$ (1.85)	$1.5 \times 10^{-27}$ (2.09)	$3.1 \times 10^{-27}$ (2.49)	$6.3 \times 10^{-24}$ (1.56)	$5.6 \times 10^{-24}$ (1.61)
[25.45]	$5.0 \times 10^{-30}$ (0.12)	$5.5 \times 10^{-30}$ (0.13)	$1.0 \times 10^{-28}$ (0.14)	$2.2 \times 10^{-28}$ (0.18)	-	-
[25.62]	$4.7 \times 10^{-30}$ (0.11)	$5.4 \times 10^{-30}$ (0.13)	$1.1 \times 10^{-28}$ (0.15)	$2.3 \times 10^{-28}$ (0.18)	-	-
26.35	$5.3 \times 10^{-30}$ (0.12)	$5.9 \times 10^{-30}$ (0.14)	$1.1 \times 10^{-28}$ (0.16)	$2.6 \times 10^{-28}$ (0.21)	$6 \times 10^{-26}$ (0.02)	$6.5 \times 10^{-26}$ (0.02)
[37.41]	$7.4 \times 10^{-30}$ (0.17)	$8.2 \times 10^{-30}$ (0.20)	$1.5 \times 10^{-28}$ (0.20)	$3.2 \times 10^{-28}$ (0.26)	-	-
[43.01]	$8.5 \times 10^{-30}$ (0.20)	$8.8 \times 10^{-30}$ (0.21)	$1.7 \times 10^{-28}$ (0.23)	$3.4 \times 10^{-28}$ (0.27)	-	-
43.68	$1.1 \times 10^{-29}$ (0.26)	$1.2 \times 10^{-29}$ (0.29)	$2.4 \times 10^{-28}$ (0.33)	$5.3 \times 10^{-28}$ (0.43)	$6.7 \times 10^{-25}$ (0.17)	$6.1 \times 10^{-25}$ (0.18)
[82.09]	$1.1 \times 10^{-29}$ (0.25)	$1.3 \times 10^{-29}$ (0.30)	$1.8 \times 10^{-28}$ (0.25)	$3.0 \times 10^{-28}$ (0.24)	-	-
110.23	$1.3 \times 10^{-29}$ (0.30)	$1.4 \times 10^{-29}$ (0.33)	$2.8 \times 10^{-28}$ (0.39)	$6.4 \times 10^{-28}$ (0.51)	$1.8 \times 10^{-25}$ (0.04)	$1.8 \times 10^{-25}$ (0.05)

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