Top: relative pulsation energy levels in U TrA (sum of the energy terms corresponding to each group divided by the total sum of the energy terms). Open symbols are the values calculated by Faulkner & Shobbrook (1979) and Faulkner & Shobbrook (1983); data that were analysed in both studies are connected with vertical lines. Filled symbols: our analysis of the following data sets: Jansen (1962), Mitchell et al. (1964), Stobie & Balona (1979), Hipparcos (ESA 1997), Berdnikov (1995, 2008) and MOST. Bottom: E₁/E₀ energy relation of the first overtone and the fundamental mode.