diff --git a/b_asic/gui_utils/plot_window.py b/b_asic/gui_utils/plot_window.py
index 446c500e20cbb3294d4525eb19459047c0ae0932..755adada2fd86a81077d00f19f6f02b8421f92c9 100644
--- a/b_asic/gui_utils/plot_window.py
+++ b/b_asic/gui_utils/plot_window.py
@@ -67,17 +67,17 @@ class PlotWindow(QWidget):
         ########### Flattening sim_result, if it is a list of results #######
         # take: sim_result (possibly on form ['name1', simres1, 'name2', simres2, ...]
         # generate: sim_result (dict)
-        if type(sim_result) == Simulation:
+        if isinstance(sim_result, Simulation):
             sim_result = sim_result._results
-            assert type(sim_result) == dict, TypeError(
+            assert isinstance(sim_result, dict), TypeError(
                 "Parsing sim_result as a Simulation, but the _result seems broken."
             )
-        elif type(sim_result) == list:
+        elif isinstance(sim_result, list):
             new_result = dict()
             nr = 0  # value number. Used for automatic names.
             name = None
             for element in sim_result:
-                if type(element) == str:
+                if isinstance(element, str):
                     assert not name, Exception(
                         "Parsing sim_result as a list. Did you provide two names after"
                         " each other?"
@@ -87,11 +87,11 @@ class PlotWindow(QWidget):
                     if not name:
                         nr = nr + 1
                         name = "(res" + str(nr) + ")"
-                    if type(element) == dict:
+                    if isinstance(element, dict):
                         res = element
-                    elif type(element) == Simulation:
+                    elif isinstance(element, Simulation):
                         res = element._results
-                        assert type(res) == dict, TypeError(
+                        assert isinstance(res, dict), TypeError(
                             f"Parsing sim_result as a list. Result '{name}' is a"
                             " Simulation, and its _result seems broken."
                         )
@@ -110,10 +110,10 @@ class PlotWindow(QWidget):
                 " in the list?"
             )
             sim_result = new_result
-        elif type(sim_result) != dict:
+        elif not isinstance(sim_result, dict):
             raise TypeError(
-                "sim_result must be a dict, Simulation or list. Found"
-                f" {type(sim_result)}"
+                "sim_result must be a dict, Simulation or list."
+                f" Found {type(sim_result)}"
             )
 
         ########### Categorizing/sorting/renaming sim_results: ##############
@@ -335,7 +335,7 @@ def start_simulation_dialog(
 
 # Simple test of the dialog
 if __name__ == "__main__":
-    sim_res1 = {
+    res1 = {
         '0': [1.5, 1.6, 1.5, 1],
         '1': [1.0, 2.0, 1.5, 1.1],
         'add1': [1.5, 1.5, 1, 1],
@@ -347,7 +347,7 @@ if __name__ == "__main__":
         't2': [1, 1, 2, 1],
         't3': [1, 1, 1, 2],
     }
-    sim_res2 = {
+    res2 = {
         '0': [0.5, 0.6, 0.5, 0],
         '1': [0.0, 1.0 + 0.3j, 0.5, 0.1j],
         'add1': [0.5, 0.5, 0, 0],
@@ -359,11 +359,9 @@ if __name__ == "__main__":
         't2': [0, 0, 1, 0],
         't3': [0, 0, 0, 1],
     }
-    sim_res3 = {
+    res3 = {
         '0': np.random.rand(200).tolist(),
         '1': np.random.rand(200).tolist(),
     }
-    # start_simulation_dialog(sim_res3)
-    start_simulation_dialog(
-        ['simReal', sim_res1, 'simCpx', sim_res2, sim_res3], "Test data"
-    )
+    # start_simulation_dialog(res3)
+    start_simulation_dialog(['Real', res1, 'Cpx', res2, res3], "Test data")