diff --git a/examples/PySDM_examples/Arabas_et_al_2015/settings.py b/examples/PySDM_examples/Arabas_et_al_2015/settings.py
index cb58b24b9..04ffbde8b 100644
--- a/examples/PySDM_examples/Arabas_et_al_2015/settings.py
+++ b/examples/PySDM_examples/Arabas_et_al_2015/settings.py
@@ -1,12 +1,8 @@
 from typing import Iterable
 
-import numpy as np
 from PySDM_examples.Morrison_and_Grabowski_2007.strato_cumulus import StratoCumulus
 
 from PySDM import Formulae
-from PySDM.dynamics.collisions.breakup_efficiencies import ConstEb
-from PySDM.dynamics.collisions.breakup_fragmentations import Gaussian
-from PySDM.dynamics.collisions.coalescence_efficiencies import ConstEc
 from PySDM.physics import si
 
 
@@ -39,12 +35,3 @@ def __init__(
         self.simulation_time = 90 * si.minute
         self.dt = 5 * si.second
         self.spin_up_time = 1 * si.hour
-
-        # additional breakup dynamics
-        mu_r = 10 * si.um
-        mu = 4 / 3 * np.pi * mu_r**3
-        sigma = mu / 2.5
-        vmin = mu / 1000
-        self.coalescence_efficiency = ConstEc(Ec=0.95)
-        self.breakup_efficiency = ConstEb(Eb=1.0)
-        self.breakup_fragmentation = Gaussian(mu=mu, sigma=sigma, vmin=vmin, nfmax=10)