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{\color{red} How does your HR diagram compare to the example in Figure {\bf x}? We mentioned that Figure {\bf x} covers a wider range of colours and magnitudes, can you think of why this might be? Why are you missing especially blue and red stars?}  {\color{blue}{\it Extra question:}} Do you get the same or similar H-R HR  diagram if you use a different set of magnitudes? (ie.\ $R$ and $I$ instead of  $B$ and $V$) If there is any discrepancy, can you explain why? You will need to think carefully about this: what exactly does colour measure? If stars are just black-bodies, when would you expect colours to be the same or different?