\journalname
Astronomy&AstrophysicsReview
The evolutionary changes are seen even more clearly in Fig. \ref{logRlogT}, equivalent to a plot of radius vs. spectral type. Here, however, as both temperature and radius change during the evolution, the stars will move roughly diagonally towards the upper right. The range in \(R\) for a given \(T_{\rm eff}\) is much larger than for \(M\), up to a factor of \(\sim\)3 – again far more than the tiny errors in the individual values of \(R\).