The documentation for the Poisson distribution in boost/math/distributions (http://www.boost.org/doc/libs/1_41_0/libs/math/doc/sf_and_dist/html/math_too...) contains a few errors. In the middle of the page is a bar graph depicting the Poisson distribution for several values of lambda. The one labeled for lambda=1 is actually the distribution for lambda=5. Similarly the one labeled as lambda=50 appears to be generated for lambda=20 instead. Please check this and correct as needed.

Oh :-( And I distinctly remember fixing this once before too :-( Committing fixed graphs now, Thanks for the heads-up, John.