\begin{table}%tb1
%\centering
\par
\caption{\label{tab:band30}Main beam characteristics as a function of frequency for the 30~GHz channel, for the $Y$-polarisation (main arm) of feed horn LFI-27.}
\begin{tabular}{c c c c c r@{.}l c c c c}
\hline\hline \noalign{\smallskip}
Frequency & Edge Taper & ${\cal D}_{\rm feed}$\tablefootmark{a} & $FWHM$ & 
$e$\tablefootmark{b} & \multicolumn{2}{c}{$\tau$\tablefootmark{c}} & 
$\cal D$ \tablefootmark{d} & XPD\tablefootmark{e} & $d$\tablefootmark{f} &  $\cal S$ \tablefootmark{g} \\
(GHz) & (dB @ $22^\circ$) & (dBi)&(arcmin)& &
\multicolumn{2}{c}{($^\circ$)} & (dBi) & (dB) & (\%) & (\%) \\ 
\hline
27.0 & 18.59 & 20.42 & 32.80 & 1.32 & $-$89&9 & 51.06 & 27.09 & 0.556 & 0.87 \\
27.2 & 19.11 & 20.51 & 32.80 & 1.32 & $-$89&9 & 51.06 & 27.19 & 0.542 & 0.80 \\
27.4 & 19.64 & 20.59 & 32.75 & 1.32 & $-$89&9 & 51.08 & 27.26 & 0.531 & 0.75 \\
27.6 & 20.18 & 20.67 & 32.74 & 1.33 & $-$89&9 & 51.09 & 27.30 & 0.521 & 0.71 \\
27.8 & 20.74 & 20.75 & 32.72 & 1.34 & $-$89&9 & 51.10 & 27.38 & 0.510 & 0.66 \\
28.0 & 21.33 & 20.84 & 32.72 & 1.34 & $-$89&9 & 51.10 & 27.47 & 0.498 & 0.62 \\
28.2 & 21.97 & 20.93 & 32.66 & 1.35 & $-$90&0 & 51.10 & 27.56 & 0.487 & 0.59 \\
28.4 & 22.65 & 21.01 & 32.73 & 1.36 & $-$90&0 & 51.10 & 27.61 & 0.477 & 0.56 \\
28.6 & 23.40 & 21.09 & 32.77 & 1.36 & $-$90&0 & 51.09 & 27.68 & 0.467 & 0.55 \\
28.8 & 24.21 & 21.17 & 32.80 & 1.37 & $-$90&0 & 51.08 & 27.80 & 0.457 & 0.53 \\
29.0 & 25.08 & 21.25 & 32.91 & 1.38 &    90&0 & 51.08 & 27.95 & 0.447 & 0.53 \\
29.2 & 26.01 & 21.34 & 32.98 & 1.38 &    90&0 & 51.06 & 28.10 & 0.437 & 0.53 \\
29.4 & 27.04 & 21.42 & 33.05 & 1.39 &    90&0 & 51.04 & 28.19 & 0.430 & 0.53 \\
29.6 & 28.19 & 21.51 & 33.08 & 1.40 &    90&0 & 51.03 & 28.28 & 0.424 & 0.54 \\
29.8 & 29.35 & 21.59 & 33.15 & 1.40 &    90&0 & 51.01 & 28.41 & 0.418 & 0.55 \\
30.0 & 30.43 & 21.67 & 33.23 & 1.41 &    89&9 & 51.00 & 28.31 & 0.412 & 0.58 \\
30.2 & 31.52 & 21.74 & 33.35 & 1.41 &    89&9 & 50.98 & 28.20 & 0.405 & 0.62 \\
30.4 & 32.74 & 21.80 & 33.42 & 1.41 &    89&9 & 50.95 & 28.17 & 0.399 & 0.65 \\
30.6 & 33.80 & 21.88 & 33.50 & 1.41 &    89&9 & 50.93 & 28.18 & 0.393 & 0.67 \\
30.8 & 34.56 & 21.96 & 33.58 & 1.42 &    89&9 & 50.92 & 28.13 & 0.388 & 0.69 \\
31.0 & 34.77 & 22.03 & 33.63 & 1.41 &    89&9 & 50.91 & 28.01 & 0.384 & 0.73 \\
31.2 & 34.57 & 22.10 & 33.63 & 1.41 &    89&9 & 50.90 & 27.96 & 0.379 & 0.77 \\
31.4 & 34.40 & 22.16 & 33.70 & 1.40 &    89&9 & 50.89 & 28.04 & 0.371 & 0.79 \\
31.6 & 34.42 & 22.22 & 33.70 & 1.40 &    89&9 & 50.89 & 28.30 & 0.363 & 0.80 \\
31.8 & 34.46 & 22.27 & 33.66 & 1.40 &    90&0 & 50.89 & 28.58 & 0.356 & 0.80 \\
32.0 & 34.57 & 22.31 & 33.62 & 1.39 &    90&0 & 50.89 & 28.88 & 0.349 & 0.80 \\
32.2 & 35.12 & 22.36 & 33.62 & 1.39 & $-$90&0 & 50.90 & 29.20 & 0.343 & 0.80 \\
32.4 & 36.44 & 22.41 & 33.62 & 1.39 & $-$90&0 & 50.90 & 29.38 & 0.341 & 0.80 \\
32.6 & 38.60 & 22.45 & 33.68 & 1.41 & $-$89&9 & 50.90 & 29.07 & 0.342 & 0.79 \\
32.8 & 40.77 & 22.49 & 33.80 & 1.42 & $-$89&9 & 50.88 & 28.63 & 0.347 & 0.78 \\
33.0 & 41.00 & 22.54 & 34.02 & 1.44 & $-$89&9 & 50.86 & 28.36 & 0.350 & 0.79 \\
\hline
\end{tabular}
\tablefoot{\tablefoottext{a}{feed directivity;}
\tablefoottext{b}{ellipticity;}
\tablefoottext{c}{rotation angle of the polarisation ellipse;}
\tablefoottext{d}{main beam directivity;}
\tablefoottext{e}{cross polar discrimination factor;}
\tablefoottext{f}{main beam depolarisation parameter;}
\tablefoottext{g}{spillover.}}
\vspace*{8mm}
\end{table}