The energy diagram for 98 transiting planets: the energy needed to escape a unit of mass of the planet atmosphere versus the X/EUV flux reaching the top of the atmosphere per unit of time. The dotted lines indicate constant mass loss rates of ṁ = 10¹⁵ to 10⁵ g s^-1 (from left to right). Data points are calculated with η = 15%. Variations of η between 1% and 100% are represented with horizontal grey error bars. Coloured points and labels indicate transiting planets of particular interest, which are discussed in the text.