\begin{table}%t2 \caption{\label{midi_log}Log of the MIDI observations of $\ell$~Car and RS~Pup. $\phi$~is the phase of the observation for the Cepheids, relative to the maximum light in~$V$ (see Sect.~\ref{intro} for $P$ and $T_0$~values), $B$~is the projected baseline length, PA~is the position angle of the projected baseline (counted East of North~$=$~$0^\circ$), and AM~is the airmass.} \small%\centerline { \begin{tabular}{lcclccc} \hline \hline \# & MJD & $\phi$ & Target & $B$ (m) & PA ($^\circ$) & AM \\ \hline A$^{*}$ & 53~104.060 & 0.90 & $\ell$~Car & 40.82 & 48.7 & 1.27 \\ B$^{*}$ & 53~104.076 & & HD~67582 & 38.86 & 58.9 & 1.20 \\ C$^{*}$ & 53~104.090 & 0.90 & $\ell$~Car & 39.18 & 56.4 & 1.28 \\ D$^{*}$ & 53~104.104 & & HD~67582 & 35.85 & 63.5 & 1.31 \\ \hline E & 53~842.082 & 0.66 & $\ell$~Car & 117.52 & 74.4 & 1.30 \\ F & 53~842.099 & & HD~67582 & 122.80 & 70.1 & 1.21 \\ \hline G$^{**}$ & 54~045.290 & 0.90 & RS~Pup & 121.25 & 31.1 & 1.29 \\ \hline H & 54~046.275 & 0.92 & RS~Pup & 119.80 & 27.5 & 1.36 \\ I & 54~046.312 & & HD~70555 & 122.87 & 37.2 & 1.20 \\ J$^{***}$ & 54~046.343 & 0.41 & $\ell$~Car & 130.10 & 26.5 & 1.52 \\ K & 54~046.372 & & HD~94510 & 130.11 & 20.7 & 1.57 \\ \hline L & 54~047.267 & 0.95 & RS~Pup & 119.10 & 25.7 & 1.40 \\ M & 54~047.286 & & HD~70555 & 119.62 & 30.3 & 1.31 \\ \hline N & 54~048.244 & & HD~70555 & 114.88 & 17.3 & 1.63 \\ O & 54~048.270 & 0.97 & RS~Pup & 119.79 & 27.5 & 1.36 \\ P & 54~048.347 & 0.46 & $\ell$~Car & 130.03 & 29.3 & 1.48 \\ Q & 54~048.366 & & HD~94510 & 130.10 & 20.4 & 1.57 \\ \hline \end{tabular}} \medskip $^{*}$ $\ell$~Car observations obtained in 2004 (see Sect.~\ref{midi_obs}); $^{**}$~observation~\#G of RS~Pup was not calibrated; $^{***}$~observation~\#J of $\ell$~Car has a low interferometric flux. \end{table}