Measurements of the amplitude of the phase spiral as a function of angular momentum. Top: number density of stars at low, medium, and high angular momentum, showing the phase spiral change shape and amplitude. Bottom: amplitude of the phase-spiral pattern as a function of angular momentum. The lines are the same as in Fig. 3. The sample only includes stars that are within 500 pc radially of where a star with the same angular momentum on a circular orbit would be and have a galactocentric radial velocity of less than 22.5 km s⁻¹ in order to restrict the selection to stars on cold orbits. The shaded area shows the 84th and 16th percentiles.