Energy E vs. angular momenta L _z of GCs in our sample. The black dotted line marks the boundary between in situ (lower E) and accreted (higher E) clusters. The colors indicate mean change in energy ΔE as the bar’s pattern speed slows from Ω_b = 80 to 35 km s⁻¹ kpc⁻¹. Most of the GCs with ΔE > 0 are located around L _z ∼ 1000 kpc km s⁻¹ and E ∼ −0.7 × 10⁵ km² s⁻².