diff --git a/cara/montecarlo.py b/cara/montecarlo.py
index c37d6282..a85e4840 100644
--- a/cara/montecarlo.py
+++ b/cara/montecarlo.py
@@ -2,14 +2,12 @@ import cara.models
 import numpy as np
 
 # The (k, lambda) parameters for the weibull-distributions corresponding to each quantity
-weibull_parameters = {
-    'emission_concentration': (0.5951563631241763, 0.027071715346754264),
-    'emission_rate_speaking': (2.0432559401256634, 3.3746316960164147),
-    'emission_rate_speaking_loudly': (2.317686940362959, 5.515253884170728),
-    'particle_diameter_breathing': (15.312035476444153, 0.8433059432279654),
-    'particle_diameter_speaking': (5.9493671011143965, 1.081521101924364),
-    'particle_diameter_speaking_loudly': (7.348365409721486, 1.1158159287760463)
-}
+weibull_parameters = [((0.5951563631241763, 0.027071715346754264), # emission_concentration
+                       (15.312035476444153, 0.8433059432279654)), # particle_diameter_breathing
+                      ((2.0432559401256634, 3.3746316960164147), # emission_rate_speaking
+                       (5.9493671011143965, 1.081521101924364)), # particle_diameter_speaking
+                      ((2.317686940362959, 5.515253884170728), # emission_rate_speaking_loudly
+                       (7.348365409721486, 1.1158159287760463))] # particle_diameter_speaking_loudly
 
 
 def calculate_qr(viral_load: float, emission: float, diameter: float, mask_efficiency: float,