Now assuming a round focus. It's a good approx.
Fixed a syntax error.
Fixed some annoying mistakes.
Added a dashed line and fixed the xticks spacing.
Made compatible with SymPy v0.7.0; not setting xticks.
Made compatible with SymPy 0.7.0; not setting xticks.
Merge branch 'round_focus' of github.com:ivang/DTeval into round_focus