This diagram shows the stars with their spectral types up to a distance of 1000 ly represent.
This one looks nice, that very hot stars (spectral type O and B) only occur at a great distance from the Sun. While red dwarfs occur most frequently and in less than 30 ly are very numerous.
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To classify some stars are highlighted and given her name. These stars can be configured via the file 'sterne3.txt'.