diff --git a/pes_to_spec/test/prepare_plots.py b/pes_to_spec/test/prepare_plots.py
index a0b4222316050bce3b3b9b48f0ca9fab9baaee58..73c8052eaa7c5d3629a426fa12ceab81315f2e9d 100755
--- a/pes_to_spec/test/prepare_plots.py
+++ b/pes_to_spec/test/prepare_plots.py
@@ -135,7 +135,8 @@ def plot_chi2_intensity(df: pd.DataFrame, filename: str):
     #            fill=True,
     #            ax=ax)
     sns.scatterplot(x=df.chi2_prepca/df.ndof.iloc[0], y=df.xgm_flux_t*1e-3,
-                    s=20,
+                    s=30,
+                    marker='+',
                     #alpha=0.4,
                     c="tab:red",
                     #size=df.root_mean_squared_pca_unc,
@@ -542,7 +543,7 @@ if __name__ == '__main__':
 
     df_model = pd.read_csv(f'{indir}/model.csv')
     df_model.impulse = df_model.impulse.str.replace('i','j').apply(lambda x: complex(x))
-    df_model.wiener_filter = df_model.wiener_filter.str.replace('i','j').apply(lambda x: complex(x))
+    df_model.wiener_filter = df_model.wiener_filter.astype(str).str.replace('i','j').apply(lambda x: complex(x))
     plot_impulse(df_model, f'impulse.pdf')
     plot_wiener(df_model, f'wiener.pdf')