Pulse profiles per HWP angle adjustment for single degree of arc increments from 0° to 45°, from the optimized pulse profiles of Fig. 2, are depicted. Displayed in their respective axes are adjustments for double b-PORC for ϕ1, ϕ2, ϕ3, ϕ4, ϕ5, ϕ6, ϕ7 and ϕ8 (a–h).