Stellar number density computed from the evolution tracks assuming only IMF (a), top) and IMF+SFR (b), bottom) without colour cuts. Middle panels: with the colour cut (0.23 <J − K< 0.45) and stellar parameter limits (3.5 ≤ log g ≤ 4.5) to simulate the selection effect of the survey and our stellar sample. Right: the suppression factor, defined as the ratio of stars with cut to the number of stars without cut, i.e. the larger the number the more stars are suppressed (see text).
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