Left: distribution of the sources with LAMOST DR6 spectra in the log Teff vs. MKs (grey). The orange solid line indicates Teff = 9700 K, which corresponds to the temperature of a A0V-type star (Pecaut & Mamajek 2013). The isochrones are colour-coded according to their age (in Myr). Right: same as left, with the isochrones colour-coded according to their mass.
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