diff --git a/variableEffect.py b/variableEffect.py
index 2732be9..354556e 100644
--- a/variableEffect.py
+++ b/variableEffect.py
@@ -46,8 +46,8 @@ def main():
 
 
 def test_effect_of_two_variables():
-    eod_freqs = np.arange(100, 1001, 20)
-    ref_periods = np.arange(0, 0.00201, 0.0001)
+    eod_freqs = np.arange(100, 1001, 50)
+    ref_periods = np.arange(0, 0.00201, 0.0002)
     variables = ("bf", "vs", "sc", "cv", "burst", "f_inf_s", "f_zero_s")
     colorbar_labels = ("Frequency in Hz", "Vector strength", "serial correlation lag=1", "Coefficient of Variation",
                        "Burstiness", "f_inf slope", "f_zero slope")