diff --git a/observation_sim/instruments/chip/effects.py b/observation_sim/instruments/chip/effects.py
index 4aa0fc9b48e88aad6322b23219f1f67e71b77e7c..bef8da0bd73b6b6308b584cf636d6f10085803a3 100644
--- a/observation_sim/instruments/chip/effects.py
+++ b/observation_sim/instruments/chip/effects.py
@@ -267,7 +267,7 @@ def PRNU_Img(xsize, ysize, sigma=0.01, seed=202101):
     return prnuimg
 
 
-def NonLinear_f(x, beta_1, beta_2):  
+def NonLinear_f(x, beta_1, beta_2):
     return x - beta_1 * x * x + beta_2 * x * x * x
 
 
@@ -697,7 +697,7 @@ def produceCR_Map(xLen, yLen, exTime, cr_pixelRatio, gain, attachedSizes, seed=2
     for i in np.arange(cr_event_size):
         xPos = round((xLen - 1) * np.random.random())
         yPos = round((yLen - 1) * np.random.random())
-        cr_lens = int(cr_size[i]);
+        cr_lens = int(cr_size[i])
         if cr_lens == 0:
             continue
         pix_energy = cr_energys[i]/gain/cr_lens