Pebble isolation mass as a function of orbital distance for disks with four different initial gas surface densities, from 100 g cm⁻² to 2000 g cm⁻². The turbulence parameter in viscosity is α = 10⁻³ in the left panel, α = 5 × 10⁻⁴ in the middle panel, and α = 10⁻⁴ in the right panel. The fragmentation velocity is u_f = 1 m s⁻¹. We also include the planetary masses of Kepler systems, with radii up to 4 R_⊕, derived through the Forecaster package (Chen & Kipping 2017) (gray circles) and super-Earths detected by RV (blue circles). The dashed lines correspond to the disk regions interior to the ice line, whereas the solid lines are the regions exterior to the ice line, where the forming planets are water rich.