Comparison of the results of this work with values from the literature. For better readability, the errorbars of this work are plotted in gray. Different symbols mark different determination methods of literature values. The ellipse in the top left panel marks the outlier star GJ 87 (J02123+035). Legend: fit (synthetic model fit): Passegger et al. (2019), Gaidos & Mann (2014) (Teff VIS), Mann et al. (2015) (Teff); spec (pEWs, spectral indices, spectroscopic relations): Rojas-Ayala et al. (2012); Maldonado et al. (2015), Gaidos & Mann (2014) (Teff NIR, log g, [Fe/H]), Mann et al. (2015) (log g, [Fe/H]), Terrien et al. (2015); ML: Antoniadis-Karnavas et al. (2020); phot (photometric): Dittmann et al. (2016); Houdebine et al. (2019); interfer (interferometry): Maldonado et al. (2015).