Hello all,

Perhaps three useful links, for teachers interested in showing
to their classrooms, how open clusters fundamental parameters
and evolutive scenarios can be obtained, through photometry
only.

First link, from Cds-Astroweb Astronomy Educational Resurces:

http://cdsweb.u-strasbg.fr/astroweb/education.html
- Once within astroweb page, please reach and select
" Hr Trace Connection " link.


Second link, from Intute Science and Technology UK:

http://www.intute.ac.uk/cgi-bin/search.pl?term1=hr+trace&submit.x=12&submit.y=9&\
submit=Go&limit=0&subject=All


Third link, with quick code description:

http://xoomer.alice.it/hrtrace/Geberal_Info_Wd.htm


Regards.