Fig. 5.
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(a) G absolute magnitude versus BP − RP diagram. G absolute magnitude computed from the inverse of the parallax with no correction of extinction. The entire LAMOST DR7 late M sample is plotted in cyan dots, whereas the ultracool dwarfs are in black solid circles. (b) Gaia G − RP versus BP − RP color-color diagram. Symbols are the same as in the top panel.
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