I've been reading the wikipedia article on the atomic orbitals of hydrogen. They have a nice collection of diagrams, such as this one for n,l,m = 3,1,1
This is apparently showing the wavefunction, not the probability density, and the blue area represents positive phase, red represents negative.
My problem is this: this particular wavefunction contains a term $\exp(+i\phi)$, so how has this graph been drawn taking into account the complex part? And what are they referring to when they talk about phase?
Edit, this is the 311 wavefunction containing the $\exp(+i\phi)$ term