\begin{table}%t1
\caption{\label{visir_log}Log of the VISIR observations of $\ell$~Car and RS~Pup. MJD$^*$~is the modified Julian date of the start the exposures on the target minus~54~000, and $\phi$~the phase of the Cepheid. 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) measured by the observatory DIMM sensor, in arcseconds, and AM is the airmass of the observation. The duration of each observation was 360~s on target.} 
\par
\small%\centerline
 {
\begin{tabular}{lcclcccc}
\hline \hline
\# & MJD$^*$ & $\phi$ & Star & Filter & DIT & $\theta$\ & AM \\
\hline
a & 609.953 & & HD~76110 & PAH1 & 16 & 1.5 & 1.09 \\
b & 609.961 & & HD~76110 & PAH2 & 8 & 1.4 & 1.11 \\
c$^{*}$ & 609.980 & 0.53 & RS~Pup & PAH1 & 16 & 1.6 & 1.26 \\
d & 609.987 & 0.53 & RS~Pup & PAH2 & 8 & 1.3 & 1.31 \\
e & 610.002 & 0.26 & $\ell$~Car & PAH1 & 16 & 1.5 & 1.34 \\
f & 610.009 & 0.26 & $\ell$~Car & PAH2 & 8 & 1.3 & 1.37 \\
g & 610.035 & & HD~89682 & PAH1 & 16 & 1.6 & 1.26 \\
h & 610.042 & & HD~89682 & PAH2 & 8 & 1.8 & 1.29 \\
i & 610.081 & & HD~98118 & PAH1 & 16 & 1.7 & 1.31 \\
j & 610.089 & & HD~98118 & PAH2 & 8 & 1.6 & 1.36 \\
\hline
k & 610.960 & & HD~76110 & PAH1 & 16 & 0.7 & 1.11 \\
l & 610.967 & & HD~76110 & SIC  & 20 & 0.9 & 1.13 \\
m & 610.979 & 0.29 & $\ell$~Car & PAH1 & 16 & 1.0 & 1.31 \\
n & 610.986 & 0.29 & $\ell$~Car & SIC  & 20 & 0.8 & 1.32 \\
o & 610.998 & 0.55 & RS~Pup & PAH1 & 16 & 0.8 & 1.38 \\
p$^{*}$ & 611.005 & 0.55 & RS~Pup & SIC  & 20 & 0.9 & 1.44 \\
q & 611.016 & & HD~89682 & PAH1 & 16 & 0.6 & 1.23 \\
r & 611.024 & & HD~89682 & SIC  & 20 & 0.9 & 1.24 \\
s & 611.073 & & HD~124294 & PAH1 & 16 & 0.8 & 1.06 \\
t & 611.081 & & HD~124294 & SIC  & 20 & 0.8 & 1.05 \\
\hline
\end{tabular}}
\medskip
$^{*}$ Observations \#c and \#p suffer from low photometric SNR.
\end{table}