a): Schematic depiction of a poloidal slice of the magnetosphere of an isolated pulsar, reproduced from GLP Fig. 1. The vertical dashed lines mark the location of the LC (ρ/R_L = 1, with ρ and z being the cylindrical coordinates measuring the distance to and along the rotation axis, and the LC is at ρ = R_L). The red curves represent the CSs that demarcate the different magnetic domains (1) (inside the shaded bubble containing closed field lines) and (2) (open field line region). b): A depiction of the split monopole solution, with a CS on the equatorial plane, facilitating the change of field line direction across it.