Amplitude of the pulsed radio emission as a function of the longitude from the ascending node for PSR J1036−4353 in four different frequency sub-bands. The amplitude is measured over a pulse phase range of 0.2 around the peak. The central frequency and bandwidth of each sub-band are reported in the bottom-right corner. Points between longitudes 22° and 130° have not been plotted either because no data at all (between 34° and 94°) or not enough data had been recorded, resulting in a much higher level of noise.