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Can you see a line of stars; a main sequence? If you see a main  sequence, do you see stars in any other regions in the diagram?  Compare your diagram to a the  colour-magnitude diagram in one of the text  books Figure {\bf x}  and see if you can figure out what types of stars are present in this cluster. Note that the this  HR diagrams in the textbooks will probably cover diagram covers  a wider range of abs absolute  magnitude and colour than your plot, so be careful when identifying stars which are off the main sequence. {\it {\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:} question:}}  Do you get the same or similar H-R 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?