Peak-normalised Hα (green) and Paα (turquoise) surface brightness profiles for our stacks shown in Figure 4. Both profiles are more extended than their PSFs, demonstrating that they are well resolved. At the lowest and highest masses, the Hα emission is more extended than the Paα emission, whereas their spatial profiles are similar for our middle stellar mass bin, at least out to ∼2 kiloparsecs after which the Paα emission is more extended than the Hα emission.