Masses and the incident fluxes received by the TRAPPIST-1 planets, compared to other exoplanets found by the transit method (yellow), via the radial-velocity technique (blue), and to the terrestrial worlds of the Solar system (grey). We highlight two ranges of interest in mass and incident flux. All objects contained in the exoplanet.eu catalogue (Schneider et al. 2011), found by the RV, or the transit method, are included in this figure.