Table 11: Number of dwarfs in each subsample.
[Fe/H] Clean Polluted Clean Polluted
    ( beta+ ubvy)   ( beta+ ubvy)
  >5700 >5700 >6000 >6000
$\leq $-2.5 8 0+2 7 0+1
-2.5 to -2.0 9 2+0 6 0+0
-2.0 to -1.5 16 1+1 9 1+0


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