diff --git a/fitter.py b/fitter.py
index 0484c9a..deed0eb 100644
--- a/fitter.py
+++ b/fitter.py
@@ -118,7 +118,15 @@ class Fitter:
             (10, 100, 100, 100, 10, 10),
         )
 
-        res = least_squares(self.cost_func, init_parameters, bounds=bounds, xtol=1e-10)
+        res = least_squares(
+            self.cost_func, 
+            init_parameters, 
+            bounds=bounds, 
+            xtol=1e-10,
+            ftol=1e-12,  
+            verbose=2
+        )
+
         print()
         print("   Parameters: [gGaL, ECal, K_pc_half, tau_xfer, tau_RC, offset]")
         print("      Initial:", init_parameters.tolist())