Evolution over time (from left to right, τ = 0.5, 1, and 2) of the normalised angular frequency Ω (dot-dashed lines) and Ω − κ/2 (solid curves) radial profiles of the barred low stellar mass (blue curves, top row) and high stellar mass (red curves, bottom row) models. The quantity used in the normalisation is the bar pattern speed Ω_b. The horizontal black dashed line represents Ω = Ω_b.