Gamma-ray pulse profiles (black histograms) for the young pulsars PSR J1055−6028 (left), J1705−1906 (middle), and J1913+0904 (right). Each gamma-ray event is weighted, and the error bars are explained in Sect. 2.2. The horizontal dotted lines are the background levels, with ±1σ uncertainties. Each pulsar rotation is shown twice. Fits to the light curves overlay the histogram for phases 0 to 1 (blue in the electronic version), and the phase-aligned ~1.4 GHz radio profiles are also shown (red curves).