Hello SciPy list; For my thesis I have an image which is also a spectrum of an object. I want to plot the image using imshow along with a data plot of the intensity, as can be seen on http://yfrog.com/0tforscipylistp . My questions are 2: 1) imshow() sets the ticks on the two upper subplots as pixels coordinates. What I want to show as tick labels on my x-axis is the wavelength coordinates of the lower plot on the upper images (since there is a straightforward pixel-to-wavelength conversion). I have googled everywhere but can't seem to find a solution, is it possible? 2) Is there any possible way to make the subplots layout look a bit nicer? Ideally to squeeze the two upper plots closer together and stretch the lower plot vertically, or at least to make the two upper subplots take up an equal amount of space? Best regards; Emil, python-newb and (former) IDL-user, Master student of Astrophysics at the University of Copenhagen, Niels Bohr Instutute.