Time series and results of LS analysis for all velocity components in G5.900−0.340. The left-hand column shows the time series of flux density of each velocity feature. We excluded the data points with flux densities of less than 3σ. The second and third columns show the Lomb–Scargle power spectra plots. The dotted lines in the second and third columns represent the |$0.01\%$| false alarm probability (probability of judging noise as a real signal) levels; if the peak value of the power spectrum is higher than the dotted line, the obtained period is reliable.