diff --git a/python/tffpy/experiments/exp_approx.py b/python/tffpy/experiments/exp_approx.py
index ab069ba45d4388b2013fb7c567eb18447e37648d..20ef0226b9a46b4e5366a9a3e9b3d433ecb25eee 100644
--- a/python/tffpy/experiments/exp_approx.py
+++ b/python/tffpy/experiments/exp_approx.py
@@ -77,8 +77,7 @@ class ApproxExperiment(SolveTffExperiment):
                               crop=None,
                               fig_dir=None)
         solver_params = dict(tol_subregions=[None, 1e-5],
-                             tolerance_arrf=list(10**np.arange(-3, -0.5, 1))
-                                            + list(10**np.arange(-1, 0, 0.2)),
+                             tolerance_arrf=list(10.0**np.arange(-3, 5, 1)),
                              proba_arrf=1 - 1e-4,
                              rand_state=np.arange(3))
         if setting == 'light':