HR-diagram of sample stars. In the top (bottom) panel, they are color-coded by their A(Li) (¹²C/¹³C). Different symbols represent stars in different evolutionary stages. Top panel also includes different symbols for Li upper limits and measurements. MESA evolutionary tracks for solar-metallicity with different masses are included. The approximate position of the base of the RGB and luminosity bump is depicted with dotted lines. Note that the Li abundance of HIP3137 significantly exceeds the top of the color bar range.