Comparison between the observed pulse profile (left panels) and the recovered intrinsic pulse profile (right panels) for PSR B1937+21. Top: average pulse profiles at 327 MHz (bandwidth of 3.125 MHz) for our two observations at MJD 58245 and MJD 58298. On the right, the profile for MJD 58298 is plotted with a dashed line to help visually identify both profiles. Middle: average pulse profiles for the observation on MJD 58245 across the 19 frequency bands. Bottom: pulse profiles at 327 MHz (bandwidth of 3.125 MHz) across time for the observation on MJD 58245.