Figure 9.
![Distribution of stellar parameters from LAMOST-SPEMR catalogue. The colour in this figure represents $\rm [Fe/H]$, and the three isochrones represent the evolutionary tracks of MIST stars with stellar ages of 7 Gyr [$\rm [Fe/H]$ = −0.5 (cyan), 0.0 (yellow), and 0.5 (red), respectively]. The S/N intervals are $\rm 10 \le S/N \lt 20$, $\rm 20 \le S/N \lt 40$, $\rm 40 \le S/N \lt 60$, and $\rm 60 \le S/N \lt 100$, respectively.](https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/mnras/523/4/10.1093_mnras_stad1778/1/stad1778fig9.jpeg?Expires=1749317528&Signature=O5Zt6flvhfkW73QD3bhUGEv3hNcrZNHm3ZgttFgwotMitU0Gpw9~w8F-5vSkc4wFus63GK6t0scMyqpByWeFJbvH7aArNFYHKGL94IEWWqM-VJyFoa4GYytmcy61OfT0KiCeLpicQm2CE3rO1VElZWNUuDbvLtbgXbiNH--0oZX97ieaSvLxnuYvVh2WCj01G-uWY~HTnCGNmSGy8ImrdT5kyK~R-pRsFCgl8YzmcPC9Ox~k6Glw4tkPv1ETWzXEloVIByWMzK6QXwKffFZTKRRd66EHHbUoBFk-~LVEALZItDEz5lP12BCmiiEim4Nq-~5RPQJM-lcisrfmvH52Rg__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Distribution of stellar parameters from LAMOST-SPEMR catalogue. The colour in this figure represents |$\rm [Fe/H]$|, and the three isochrones represent the evolutionary tracks of MIST stars with stellar ages of 7 Gyr [|$\rm [Fe/H]$| = −0.5 (cyan), 0.0 (yellow), and 0.5 (red), respectively]. The S/N intervals are |$\rm 10 \le S/N \lt 20$|, |$\rm 20 \le S/N \lt 40$|, |$\rm 40 \le S/N \lt 60$|, and |$\rm 60 \le S/N \lt 100$|, respectively.
