FWHM as a function of beam number for a frequency of 1363 MHz. The black line shows the average FWHM when fitting a two-dimensional Gaussian function to the beam maps. The blue line shows the FWHM of the one-dimensional Gaussian along the major axis, and the orange line shows the FWHM along the minor axis. The shape of the CBs is not perfectly Gaussian, but a two-dimensional Gaussian function is a good approximation for the beam shapes within a few percent.