Growth curve for galaxies G_W (a) and G_E (b). The black points show the resulting flux with background and shot-noise uncertainties. The Kron flux is represented in purple with the shaded 68% confidence region. The growth curve flux is marked in yellow with the shaded 68% confidence region. In panel b, the colored squares represent the flux observed inside the apertures that encircle 70.8%, 83.6%, 86.3%, and 90.0% of the total energy emitted by a point-like source.