Top: fit composed of an offset to account for the change of fibres on June 1, 2015, a second-order polynomial drift, a linear dependence with the low-pass, and the high-frequency times series, over-plotted on the raw RVs of HD 15337 Middle: GLS periodogram of the RV residuals after fitting the model shown in the top panel. The planetary signal of TOI-402.01 is significant at 4.76 days. Bottom: GLS periodogram of the RV residuals after fitting the model shown in the top panel in addition to the signal of TOI-402.01. The signal of TOI-402.02 at 17.17 days appears in this periodogram, however with a moderate significance of 0.5%.