Data for the EBLM J1146-42 triple star system. Panel a: periodogram of the residuals to a double Keplerian fit. The dash-dotted horizontal line at the top of the plot corresponds to a false alarm probability of 1%. The dotted line below is for 10%. There is therefore no statistically significant periodicity within the residuals. See Appendix B for more plots for this system. Panel b: bisector for each radial velocity measurement. Panel c: radial velocity residuals to a double Keplerian fit as a function of the bisector. A negative correlation would be a marker of stellar activity, but is not apparent here.