Fig. B.1.

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Simulated spectrum of a RG star from a PHOENIX spectrum of a star with an effective temperature of 4800 K, surface gravity of 2.5, and [Fe/H] of 0.0 (gray line). Resolution and sampling were downgraded to that of LAMOST. The red line corresponds with the triangular weighting function, wℓ, of the line, ℓ, and the blue line to the flat weighting function, wc, employed for computing the continuum level. Nℓ (red dots) and Nc (blue dots) indicate the points that belong to the triangular and rectangular weighting functions, respectively.
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