set t_ut=                " fix 256 colors in tmux http://sunaku.github.io/vim-256color-bce.html

if has("termguicolors")  " set true colors
    let &t_8f = "\<Esc>[38;2;%lu;%lu;%lum"
    let &t_8b = "\<Esc>[48;2;%lu;%lu;%lum"
    set termguicolors
endif