**Table 3:** The equivalent width of SiO bands (unit is Å). The date is that of either ISAAC or ISO/SWS observations in *ddmmyy*format, which is different from the observing date of the magnitudes. Column four ( $\phi _{\rm {K}}$ ) lists the pulsation phase during the SiO observations, which is estimated from infrared K-band light curve (Whitelock et al. 2003), where 0.0 and 1.0 are the maxima. Uncertainty should be about 0.1. The optical phase ( $\phi _{\rm opt}$ ) is estimated for the ISO sample, based on the AAVSO light curve. The optical phase is usually about 0.1-0.2 of a cycle ahead of the infrared phase. Photometric magnitudes are taken from Trams et al. (1999b) for the LMC sample, and 2MASS for the Galactic sample. Luminosity class and spectral types for Galactic stars are taken from Simbad.
$\begin{displaymath}\begin{tabular}{ll cll r@{.}l \vert r@{.}l r@{.}l r@{.}l r@{... ...606 $\pm$ 0.260 & $-$2&003 $\pm$ 0.336 \\ \hline \end{tabular}\end{displaymath}$