Same as Fig. C.1 but for a disc with a pressure bump. The parameters of the bump are similar to the ones used to parametrise the gap, with a reversed amplitude A = −20. The mode is essentially of acoustic nature, while it mixes with inertial modes in the inner regions. The inertial topological mode associated with the presence of a pressure minimum at the inner edge is present, but difficult to distinguish since it is very de-localised.