Table 1: Number of counterparts of our SiO targets.
   2MASS DENIS ISOGAL MSX IRAS
   all sky data release bulge PSC PSC 1.0 PSC 1.2 PSC 2.0
   (Cutri et al. 2003) (Simon 2003) (Schuller et al. 2003) (Egan et al. 1999) (Beichman et al. 1988)
  J H $K_{\rm S}$ I J $K_{\rm S}$      
ISO    (253) 252 252 252 53 217 253 253 191  43
MSX  (188) 187 187 187  42 149 188  14 188 122
Total  (441) $^{\rm + }$439 $^{\rm ++ }$439 439 95 $^{{\rm *}}$366 $^{\rm **}$441 267 379 165

$^{\rm + }$   72 are upper limits. $^{{\rm *}}$   16 have magnitudes above saturation limits.
$^{\rm ++ }$13 are upper limits. $^{\rm **}$104 have magnitudes above saturation limits.

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