This slot has constant teeth width. Its sides are not radial.
To set up a slot type 25 you need to replace the slot geometry bloc in your machine file by this code and edit it with your values :
For the stator
Input.Geometry.type_slot_shapes = 25;
Input.Geometry.H1s = 1e-3; %[m]
Input.Geometry.H2s = 1e-3; %[m]
Input.Geometry.W3s = 1.5e-3 %[m]
Input.Geometry.W4s = 1.5e-3 %[m]
For the rotor
Input.Geometry.type_slot_shaper = 25;
Input.Geometry.H1r = 1e-3; %[m]
Input.Geometry.H2r = 1e-3; %[m]
Input.Geometry.W3r = 1.5e-3 %[m]
Input.Geometry.W4r = 1.5e-3 %[m]