Fixes in plot of continuous utd diffraction field w/o reflection contribution

applications/SoundFieldSimulation/Diffraction/plots/ita_diffraction_plot_utd_total_field_stienen_diss_w_ground.m

@@ -106,7 +106,7 @@ for n = 1 : N
     end
     
     att_sum = res_data_template;
-    att_sum.freqData = ( H ) ./ H_i; % Insertion loss
+    att_sum.freqData = ( H_1_half ) ./ H_i; % Insertion loss
         
     if n == 1
         att_sum_all = att_sum;