diff --git a/wavelength_calibration.py b/wavelength_calibration.py
index 9402c07..9134544 100644
--- a/wavelength_calibration.py
+++ b/wavelength_calibration.py
@@ -29,22 +29,20 @@ def get_extremities( signal , peaks ):
     it. The same goes for the area at the end.
     ONLY TRUE FOR THE CURRENT CALIBRATION (Hg)
     """
-    peaks_inside , i = [] , 0
+    peaks_inside , i = [ 0 , 0 ] , 0
     argmin           = len( signal ) // 2
-    while len( peaks_inside ) != 1:
-        if i > 50 or len( signal[ : argmin ] ) == 0:
-            raise Exception( 'unknown plage, cannot autocalibrate' )
-        argmin = np.argmin(
-            signal[ : argmin ]
+    argmin           = np.argmin(
+        signal[ : argmin ]
+    )
+    argmax           = np.argmax( signal[ : argmin ] )
+    peaks_inside = np.where(
+        np.logical_and(
+            argmax < peaks,
+            argmin > peaks,
         )
-        argmax = np.argmax( signal[ : argmin ] )
-        peaks_inside = np.where(
-            np.logical_and(
-                argmax < peaks,
-                argmin > peaks,
-            )
-        )[0]
-        i += 1
+    )[0]
+    if len( peaks_inside ) == 0:
+        raise Exception( 'unknown plage, cannot autocalibrate' )
     first_peak = peaks_inside[0]
 
     """