Fixed typo

Preprocessing.py

@@ -300,7 +300,7 @@ for i in range(len(corrected_epochs)):
         reject_log0[e] = ar0[e].get_reject_log(corrected_epochs[i][ee])
         # Plot and save Autorejected epochs
         fig = reject_log0[e].plot(orientation="horizontal", show=False)
-        fig.savefig(os.path.join(save_path,"AR_" + str(Subject_id_concat[i]) + "_" + str(ee) + ".png"))
+        fig.savefig(os.path.join(save_path,"AR_" + str(Subject_id[i]) + "_" + str(ee) + ".png"))
         # Close figure window
         plt.close(fig)
         # Save mean peak-to-peak voltage threshold used