Table 1: Log of the observations of $\delta$ Vel and its calibrators, HD 82668, HD 67582 and HD 80007 with VISIR. MJD^* is the modified Julian date of the middle of the exposures on the target, minus 54 580. The Detector Integration Time (DIT) is given in milliseconds for one BURST image. $\theta$ is the seeing in the visible ( $\lambda=0.5~\mu$ m) as measured by the observatory DIMM sensor, in arcseconds. N exp. is the number of selected and averaged exposures. The airmass (AM) is the average airmass of the observation.
# MJD^* Star Filter DIT N exp. $\theta$ ( $\hbox{$^{\prime\prime}$ }$ ) AM

A 0.0134 $\delta$ Vel PAH1 20 10 000 0.86 1.18

B 0.0231 $\delta$ Vel PAH1 20 10 000 1.00 1.20

C 0.0374 HD 82668 PAH1 20 5000 1.10 1.20

D 0.0603 HD 67582 PAH1 16 10 000 0.84 1.30

E 0.0774 $\delta$ Vel PAH1 16 8000 0.70 1.33

F 0.0874 $\delta$ Vel PAH1 16 8000 0.67 1.37

G 0.0977 $\delta$ Vel PAH2 8 10 000 0.60 1.42

H 0.1093 $\delta$ Vel PAH2 8 12 000 0.53 1.48

I 0.1206 $\delta$ Vel PAH2 8 10 000 0.80 1.54

J 0.1363 HD 67582 PAH2 8 10 000 1.15 1.92

K 0.1480 HD 67582 PAH2 8 10 000 1.50 2.09

L 0.1632 $\delta$ Vel NeII 16 10 000 1.29 1.91

M 0.1860 HD 80007 NeII 16 10 000 1.12 1.46

N 0.1979 HD 80007 NeII 16 10 000 1.00 1.52

**Table 1:** Log of the observations of $\delta$ Vel and its calibrators, HD 82668, HD 67582 and HD 80007 with VISIR. MJD^* is the modified Julian date of the middle of the exposures on the target, minus 54 580. The Detector Integration Time (DIT) is given in milliseconds for one BURST image. $\theta$ is the seeing in the visible ( $\lambda=0.5~\mu$ m) as measured by the observatory DIMM sensor, in arcseconds. N exp. is the number of selected and averaged exposures. The airmass (AM) is the average airmass of the observation.
#	MJD^*	Star	Filter	DIT	N exp.	$\theta$ ( $\hbox{$^{\prime\prime}$ }$ )	AM
A	0.0134	$\delta$ Vel	PAH1	20	10 000	0.86	1.18
B	0.0231	$\delta$ Vel	PAH1	20	10 000	1.00	1.20
C	0.0374	HD 82668	PAH1	20	5000	1.10	1.20
D	0.0603	HD 67582	PAH1	16	10 000	0.84	1.30
E	0.0774	$\delta$ Vel	PAH1	16	8000	0.70	1.33
F	0.0874	$\delta$ Vel	PAH1	16	8000	0.67	1.37
G	0.0977	$\delta$ Vel	PAH2	8	10 000	0.60	1.42
H	0.1093	$\delta$ Vel	PAH2	8	12 000	0.53	1.48
I	0.1206	$\delta$ Vel	PAH2	8	10 000	0.80	1.54
J	0.1363	HD 67582	PAH2	8	10 000	1.15	1.92
K	0.1480	HD 67582	PAH2	8	10 000	1.50	2.09
L	0.1632	$\delta$ Vel	NeII	16	10 000	1.29	1.91
M	0.1860	HD 80007	NeII	16	10 000	1.12	1.46
N	0.1979	HD 80007	NeII	16	10 000	1.00	1.52

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