diff --git a/Fitter.py b/Fitter.py
index 82cca69..8b0c73b 100644
--- a/Fitter.py
+++ b/Fitter.py
@@ -17,11 +17,7 @@ def main():
 
 
 def run_with_real_data():
-    count = 0
     for cell_data in icelldata_of_dir("./data/"):
-        count += 1
-        if count <= 3:
-            continue
 
         print("cell:", cell_data.get_data_path())
         trace = cell_data.get_base_traces(trace_type=cell_data.V1)
@@ -46,9 +42,10 @@ def run_with_real_data():
         with open(results_path + "fit_parameters.txt", "w") as file:
             file.writelines([str(parameters)])
 
-        results_path += "fit_routine_2_"
+        results_path += "fit_routine_3_"
         print('Fitting of cell took function took {:.3f} s'.format((end_time - start_time)))
         print_comparision_cell_model(cell_data, parameters, plot=True, savepath=results_path)
+        break
 
     pass
 
@@ -126,11 +123,15 @@ class Fitter:
         self.f_zero_values = fi_curve.f_zeros
         self.f_zero_fit = fi_curve.boltzmann_fit_vars
         self.f_zero_slope = fi_curve.get_fi_curve_slope_of_straight()
-        self.delta_a = (self.f_zero_slope / self.f_inf_slope) / 1000
+        self.f_zero_slope = fi_curve.get_fi_curve_slope_at(fi_curve.get_f_zero_and_f_inf_intersection())  # around 1/3 of the value at straight
+        self.delta_a = (self.f_zero_slope / self.f_inf_slope) / 1000  # seems to work if divided by 1000...
 
         adaption = Adaption(data, fi_curve)
         self.tau_a = adaption.get_tau_real()
-        return self.fit_routine_2(data)
+
+        print("delta_a: {:.3f}".format(self.delta_a), "tau_a: {:.3f}".format(self.tau_a))
+
+        return self.fit_routine_3(data)
         # return self.fit_model(fit_adaption=False)
 
     def fit_routine_1(self, cell_data=None):
@@ -179,6 +180,19 @@ class Fitter:
 
         return fmin, res_parameters
 
+    def fit_routine_3(self, cell_data=None):
+        # errors: [error_bf, error_vs, error_sc, error_f_inf, error_f_inf_slope, error_f_zero, error_f_zero_slope]
+        self.counter = 0
+        # fit only v_offset, mem_tau, noise_strength, input_scaling, dend_tau
+        x0 = np.array([0.02, 0.03, 70, 0.001])
+        initial_simplex = create_init_simples(x0, search_scale=2)
+        error_weights = (1, 1, 5, 1, 2, 0, 0)
+        fmin = minimize(fun=self.cost_function_with_fixed_adaption_with_dend_tau,
+                              args=(self.tau_a, self.delta_a, error_weights), x0=x0, method="Nelder-Mead",
+                              options={"initial_simplex": initial_simplex})
+        res_parameters = self.base_model.get_parameters()
+
+        return fmin, res_parameters
 
     def fit_model(self, x0=None, initial_simplex=None, fit_adaption=False):
         self.counter = 0
@@ -262,6 +276,27 @@ class Fitter:
 
         return sum(error_list)
 
+    def cost_function_with_fixed_adaption_with_dend_tau(self, X, tau_a, delta_a, error_weights=None):
+        # set model parameters:
+        model = self.base_model
+        model.set_variable("mem_tau", X[0])
+        model.set_variable("noise_strength", X[1])
+        model.set_variable("input_scaling", X[2])
+        model.set_variable("dend_tau", X[3])
+        model.set_variable("tau_a", tau_a)
+        model.set_variable("delta_a", delta_a)
+
+        base_stimulus = SinusoidalStepStimulus(self.eod_freq, 0)
+        # find right v-offset
+        test_model = model.get_model_copy()
+        test_model.set_variable("noise_strength", 0)
+        v_offset = test_model.find_v_offset(self.baseline_freq, base_stimulus)
+        model.set_variable("v_offset", v_offset)
+
+        error_list = self.calculate_errors(error_weights)
+
+        return sum(error_list)
+
     def calculate_errors(self, error_weights=None):
         baseline_freq, vector_strength, serial_correlation = self.base_model.calculate_baseline_markers(self.eod_freq,
                                                                                               self.sc_max_lag)