Evolution of stellar bar pattern speeds, Ω_bar, normalized by the final redshift pattern speeds Ω_final(z _f ), at z _f = 6, 4, and 2. The VW models are given by the red lines, and the CW models by the blue lines. Ω_final has the values in parentheses (all in units of km s⁻¹ kpc⁻¹).