Simulated timing residuals (colored circles) of PSR J1730−2304 with 10% of outliers injected (red crosses). The different colors of the timing residuals represent the systems responsible for the observations. The top plot represents the timing residuals simulated for the OneF dataset, for which we employ a single system/observation frequency for all the observations. In the central plot, we show those for the TwoF dataset for which we employ two systems/observation frequencies, and the bottom plot those for the MultiF dataset for which we consider several systems/observation frequencies.