diff --git a/src/nmreval/models/stimecho.py b/src/nmreval/models/stimecho.py
index 26cb111..a92c25d 100644
--- a/src/nmreval/models/stimecho.py
+++ b/src/nmreval/models/stimecho.py
@@ -50,8 +50,8 @@ class StimEchoZ0:
     def func(x, a, t_ev, delta, eta, mode='cos'):
         x = np.asarray(x)
 
-        theta = np.linspace(0, np.pi/2)
-        phi = np.linspace(0, 2*np.pi)
+        theta = np.linspace(0, np.pi/2, num=200)
+        phi = np.linspace(0, 2*np.pi, num=200)
         angles = np.array(list(product(theta, phi)))
         dt = theta[1] - theta[0]
         dp = phi[1] - phi[0]