Dear Kwant, I am trying to plot the phase of the hopping term. def hop_c(i,j): return np.angle(sys.hamiltonian(i, j, params=params)[0,0]) kwant.plot(sys, hop_color=hop_c, hop_lw=0.25, site_size=0, cmap=('hsv', 'hsv')); I would like the limits of the colorbar to be -pi to pi but kwant automatically sets the limits to the min and max. Is there a way to set the limits? Thanks, Eric Eric Mascot College of Liberal Arts Graduate Student and Sciences Department of Physics emasco2@uic.edu 845 W Taylor St M: 248 433 6435 2158 SES O: 312 413 2109 Chicago, IL 60607