Hi and thanks!
this transit of exoplanet, is a graph obtained from the analysis of photographs taken during a predicted transit of exoplanet (his eclipse).
measure the variable star and reference stars are taken.
program (fotodif) of differential photometry, measured and makes charts and data.
Czech page, many of them.
have a large database.
http://var2.astro.cz/ETD/predictions.php
here a graphic of the statistics,
http://gustavomuler.fotografiaastron...%20b/datos.gif
is translated by online translator, I hope it's readable.
a greeting, gustavo.