Table 5: The detected features in the 3 micron region of the sample stars. The sample stars have been classified in Meeus groups I and II (Meeus et al. 2001). Targets with AV exceeding 4 are classified as embedded sources (E). Sources with unknown or uncertain classification are flagged with "?''. The measured line fluxes and peak-over-continuum ratios of four spectral features are given: the Pfund ${\delta }$ emission line at 3.296 $\mu $m, the PAH 3.3 $\mu $m feature and the nanodiamond features at 3.43 and 3.53 $\mu $m. Tentative detections (line flux between 1-3$\sigma $) are indicated with a. The flag b indicates detected features of unclear origin, either linked to data reduction artefacts, nanodiamonds or an unknown carrier.
# Target Group Pf ${\delta }$ PAH NANO NANO Pf ${\delta }$ PAH NANO NANO
      3.296 $\mu $m 3.3 $\mu $m 3.43 $\mu $m 3.53 $\mu $m 3.296 $\mu $m 3.3 $\mu $m 3.43 $\mu $m 3.53 $\mu $m
  line flux/10-16  ${\rm W}~{\rm m}^{-2}$ peak-over-continuum ratio
1 UX Ori II 0.7 $\pm$ 0.2 <14 <16 <2.9 1.18 $\pm$ 0.05 <1.05 <1.05 <1.01
2 HD 34282 I <1.1 24 $\pm$ 7 <17 <4.7 <1.06 1.22 $\pm$ 0.07 <1.06 <1.02
3 V346 Ori I <1.4 17 $\pm$ 8 a <23 <8.4 <1.10 1.2 $\pm$ 0.1 <1.10 <1.05
4 CO Ori II <0.4 <6.9 <8.2 1.2 $\pm$ 0.7 a,b <1.05 <1.05 <1.15 1.02 $\pm$ 0.02
5 HD 35929 II 0.4 $\pm$ 0.4 a <12 <14 <2.7 1.04 $\pm$ 0.04 <1.04 <1.04 <1.01
6 StH$\alpha$41 II? <0.32 <5.8 <10 <4.2 <1.05 <1.05 <1.15 <1.05
7 HK Ori II <1.1 <31 <35 <9.0 <1.08 <1.08 <1.08 <1.03
8 HD 244604 II <1.5 <27 <31 <8.0 <1.10 <1.10 <1.10 <1.04
9 RY Ori II <0.25 <4.8 <5.7 <1.1 <1.06 <1.06 <1.06 <1.02
10 T Ori II? <3.7 <62 <69 <12 <1.06 <1.06 <1.06 <1.01
11 V380 Ori II? 5 $\pm$ 1 <86 <110 <22 1.27 $\pm$ 0.08 <1.07 <1.08 <1.02
12 V586 Ori II 0.25 $\pm$ 0.09 a <8.7 <10 <3.0 1.13 $\pm$ 0.05 <1.05 <1.05 <1.02
13 BF Ori II 0.6 $\pm$ 0.2 <7.6 <8.8 <3.5 1.15 $\pm$ 0.05 <1.05 <1.05 <1.03
14 HD 37357 II 2.1 $\pm$ 0.4 <6.2 <7.1 <3.9 1.15 $\pm$ 0.03 <1.03 <1.03 <1.02
15 N3sk 81 E <0.58 <9.7 <11 <3.1 <1.04 <1.04 <1.04 <1.02
16 HD 37411 II <0.65 <10 <12 <4.4 <1.04 <1.04 <1.04 <1.02
17 Haro 13a I <1.9 <34 <44 <7.3 <1.03 <1.03 <1.03 <1.01
18 V599 Ori E <0.24 5 $\pm$ 1 <4.2 <0.95 <1.04 1.15 $\pm$ 0.04 <1.04 <1.01
19 V350 Ori II <0.063 <1.1 <1.2 <0.37 <1.06 <1.06 <1.06 <1.02
20 HD 37806 II 1.3 $\pm$ 0.3 <17 <20 <2.3 1.14 $\pm$ 0.03 <1.03 <1.03 <1.01
21 HD 250550 I <3.3 <59 <69 <8.3 <1.16 <1.16 <1.16 <1.03
22 VY Mon E <31 <530 <670 <38 <1.17 <1.17 <1.17 <1.01
23 LkH$\alpha$215 I <0.40 <7.3 <8.8 <1.7 <1.07 <1.07 <1.07 <1.02
24 HD 259431 I 0.6 $\pm$ 0.2 a <32 <37 <4.5 1.16 $\pm$ 0.06 <1.06 <1.06 <1.01
25 R Mon I <13 <260 <350 28 $\pm$ 10 a,b <1.08 <1.08 <1.08 1.03 $\pm$ 0.01
26 V590 Mon ? <1.9 7 $\pm$ 6 a <34 2.4 $\pm$ 0.8 a,b <1.16 1.2 $\pm$ 0.2 <1.16 1.05 $\pm$ 0.02
27 GU CMa II 4.9 $\pm$ 0.8 <43 <48 <12 1.46 $\pm$ 0.09 <1.08 <1.08 <1.03
28 HD 53367 ? <1.3 <20 <24 <5.1 <1.11 <1.11 <1.11 <1.03
29 NX Pup II <3.4 <67 <75 <15 <1.04 <1.04 <1.04 <1.01
30 HD 76534 ? <0.27 <4.5 <5.2 <0.59 <1.19 <1.19 <1.19 <1.03
31 HD 85567 II <1.2 <19 <21 <3.0 <1.06 <1.06 <1.06 <1.01
32 HD 95881 II <3.1 <49 <56 <9.9 <1.10 <1.10 <1.10 <1.02
33 HD 97048 I <1.5 65 $\pm$ 20 200 $\pm$ 20 486 $\pm$ 5 <1.10 1.4 $\pm$ 0.1 2.0 $\pm$ 0.1 4.3 $\pm$ 0.2
34 HD 100546 I 9 $\pm$ 2 240 $\pm$ 40 <94 13 $\pm$ 10 a,b 1.33 $\pm$ 0.06 1.34 $\pm$ 0.06 <1.06 1.05 $\pm$ 0.04
35 HD 101412 II <1.3 13 $\pm$ 10 a <25 <7.5 <1.06 1.08 $\pm$ 0.06 <1.06 <1.03
36 T Cha II <0.85 <16 <17 <4.0 <1.07 <1.07 <1.07 <1.02
37 LSS 3027 B ? <0.46 <8.7 <8.8 <3.6 <1.73 <1.73 <1.73 <1.39
38 HD 130437 ? 1.8 $\pm$ 0.2 <6.5 <7.1 <5.6 1.64 $\pm$ 0.06 <1.06 <1.06 <1.06
39 SS73 44 I <0.89 <16 <17 <8.8 <1.05 <1.05 <1.05 <1.04
40 HD 132947 II <0.68 <8.6 <9.1 <8.1 <1.14 <1.14 <1.14 <1.18
41 HD 141569 II <0.87 <37 <38 <5.9 <1.20 <1.20 <1.20 <1.05
42 HD 142666 II <0.72 <20 <21 <5.8 <1.04 <1.04 <1.04 <1.02
43 HD 142527 I 32 $\pm$ 5 <110 <120 44 $\pm$ 9 b 1.27 $\pm$ 0.04 <1.04 <1.04 1.05 $\pm$ 0.01
44 HR 5999 II 5 $\pm$ 3 a <110 <150 <55 1.08 $\pm$ 0.04 <1.04 <1.04 <1.02
45 HD 150193 II 3.4 $\pm$ 0.3 <13 <15 <6.3 1.15 $\pm$ 0.01 <1.01 <1.01 <1.01
46 AK Sco II <0.79 <13 <15 2.5 $\pm$ 0.9 a,b <1.03 <1.03 <1.03 1.03 $\pm$ 0.01
47 V921 Sco E 86 $\pm$ 5 <160 <190 103 $\pm$ 30 b 1.42 $\pm$ 0.03 <1.03 <1.08 1.04 $\pm$ 0.01
48 KK Oph II <2.8 <47 <66 <19 <1.05 <1.05 <1.05 <1.02
49 HD 163296 II 18 $\pm$ 3 <120 <130 23 $\pm$ 7 b 1.16 $\pm$ 0.03 <1.03 <1.03 1.03 $\pm$ 0.01
50 MWC 297 E 240 $\pm$ 20 <910 <1100 535 $\pm$ 100 1.63 $\pm$ 0.05 <1.04 <1.04 1.06 $\pm$ 0.01
51 VV Ser II 2.1 $\pm$ 0.4 <23 <25 <9.0 1.13 $\pm$ 0.03 <1.03 <1.03 <1.01
52 MWC 300 E 9 $\pm$ 1 <82 <97 50 $\pm$ 9 b 1.13 $\pm$ 0.02 <1.02 <1.02 1.03 $\pm$ 0.01
53 AS 310 I <0.83 11 $\pm$ 3 <9.5 <4.0 <1.34 2.1 $\pm$ 0.5 <1.34 <1.22
54 S CrA ? 3.9 $\pm$ 0.4 <32 <35 10 $\pm$ 3 b 1.20 $\pm$ 0.03 <1.03 <1.03 1.03 $\pm$ 0.01
55 TY CrA ? <0.75 40 $\pm$ 4 <12 <4.7 <1.03 1.28 $\pm$ 0.03 <1.03 <1.02
56 R CrA I <26 <470 <550 290 $\pm$ 50 b <1.02 <1.02 <1.02 1.04 $\pm$ 0.01
57 T CrA II? <2.5 <44 <96 7 $\pm$ 1 b <1.06 <1.06 <1.19 1.04 $\pm$ 0.01
58 HD 179218 I <3.1 160 $\pm$ 20 <47 <6 <1.03 1.28 $\pm$ 0.03 <1.03 <1.04
59 HBC 687 I? <0.14 1.7$\pm$ 0.7 a <2.8 <1.0 <1.07 1.14 $\pm$ 0.07 <1.07 <1.03
60 V1295 Aql II 4.8 $\pm$ 0.6 <40 <44 <16 1.18 $\pm$ 0.02 <1.02 <1.02 <1.01

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