diff --git a/README.md b/README.md
index 34c8f4a..39f6c48 100644
--- a/README.md
+++ b/README.md
@@ -33,15 +33,15 @@ sim_params = WaveSim.autores(sim_params, trans_delays)
 
 # Run the simulation.
 images = WaveSim.wavesim(trans_delays, sim_params);
-beam_energy_map, transmit_time_map = WaveSim.beam_energy_map_and_transmit_time_map(images, sim_params);
+beam_energy_map, transmit_time_map, peak_to_peak_time_delta_map = WaveSim.beam_energy_map_and_transmit_time_map(images, sim_params);
 
 # Display results.
 include("src/view.jl")
-imshowall(images, beam_energy_map, transmit_time_map, sim_params);
+imshowall(images, beam_energy_map, transmit_time_map, peak_to_peak_time_delta_map, sim_params);
 
 # Save results.
 include("src/save.jl")
-saveall(images, beam_energy_map, transmit_time_map, sim_params, "images")
+saveall(images, beam_energy_map, transmit_time_map, peak_to_peak_time_delta_map, sim_params, "images")
 ```
 
 Visualize the wave propagating through space, over time:
diff --git a/images/beam_energy_map.png b/images/beam_energy_map.png
index e294515..675f41b 100644
Binary files a/images/beam_energy_map.png and b/images/beam_energy_map.png differ
diff --git a/images/transmit_time_map.png b/images/transmit_time_map.png
index c64fc59..5706983 100644
Binary files a/images/transmit_time_map.png and b/images/transmit_time_map.png differ
diff --git a/images/wave_propagation.gif b/images/wave_propagation.gif
index f533cc4..0fe4a17 100644
Binary files a/images/wave_propagation.gif and b/images/wave_propagation.gif differ
diff --git a/src/WaveSim.jl b/src/WaveSim.jl
index e65ae08..70aaa76 100644
--- a/src/WaveSim.jl
+++ b/src/WaveSim.jl
@@ -153,18 +153,25 @@ end
 function beam_energy_map_and_transmit_time_map(images, sim_params)
     @unpack temporal_res = sim_params
 
-    maxval, linindices = findmax(images, dims=3)
+    maxval, maxlinindices = findmax(images, dims=3)
+    minval, minlinindices = findmin(images, dims=3)
 
-    beam_energy_map = dropdims(maxval, dims=3)
+    beam_energy_map = dropdims(maxval .- minval, dims=3)  # peak to peak amplitude
 
     transmit_time_map = similar(beam_energy_map)
-
-    for linind in eachindex(linindices)
-        x, y, t = Tuple(CartesianIndices(images)[linindices[linind]])
+    for linind in eachindex(maxlinindices)
+        x, y, t = Tuple(CartesianIndices(images)[maxlinindices[linind]])
         transmit_time_map[linind] = t * temporal_res
     end
 
-    return beam_energy_map, transmit_time_map
+    peak_to_peak_time_delta_map = similar(beam_energy_map)
+    for linind in eachindex(maxlinindices)
+        x, y, tmax = Tuple(CartesianIndices(images)[maxlinindices[linind]])
+        x, y, tmin = Tuple(CartesianIndices(images)[minlinindices[linind]])
+        peak_to_peak_time_delta_map[linind] = (tmax - tmin) * temporal_res
+    end
+
+    return beam_energy_map, transmit_time_map, peak_to_peak_time_delta_map
 end
 
 
diff --git a/src/main.jl b/src/main.jl
index 9e72624..8cfa47f 100644
--- a/src/main.jl
+++ b/src/main.jl
@@ -23,17 +23,17 @@ function main()
 
   # Run the simulation.
   images = WaveSim.wavesim(trans_delays, sim_params)
-  beam_energy_map, transmit_time_map = WaveSim.beam_energy_map_and_transmit_time_map(images, sim_params)
+  beam_energy_map, transmit_time_map, peak_to_peak_time_delta_map = WaveSim.beam_energy_map_and_transmit_time_map(images, sim_params)
 
-  return beam_energy_map, transmit_time_map, images, sim_params
+  return beam_energy_map, transmit_time_map, peak_to_peak_time_delta_map, images, sim_params
 end
 
-beam_energy_map, transmit_time_map, images, sim_params = main()
+beam_energy_map, transmit_time_map, peak_to_peak_time_delta_map, images, sim_params = main()
 
 # Display results.
-include("view.jl")
-imshowall(images, beam_energy_map, transmit_time_map, sim_params)
+include("src/view.jl")
+imshowall(images, beam_energy_map, transmit_time_map, peak_to_peak_time_delta_map, sim_params)
 
 # Save results.
-include("save.jl")
-saveall(images, beam_energy_map, transmit_time_map, sim_params, "images")
+include("src/save.jl")
+saveall(images, beam_energy_map, transmit_time_map, peak_to_peak_time_delta_map, sim_params, "images")
diff --git a/src/save.jl b/src/save.jl
index 11a714e..1569a78 100644
--- a/src/save.jl
+++ b/src/save.jl
@@ -6,8 +6,9 @@ include("bilog.jl")
 const wave_propagation_filename = "wave_propagation.gif"
 const beam_energy_map_filename = "beam_energy_map.png"
 const transmit_time_map_filename = "transmit_time_map.png"
+const peak_to_peak_time_delta_map_filename = "peak_to_peak_time_delta_map.png"
 
-function saveall(images, beam_energy_map, transmit_time_map, sim_params, output_path="images")
+function saveall(images, beam_energy_map, transmit_time_map, peak_to_peak_time_delta_map, sim_params, output_path="images")
     mkpath(output_path)
 
     @unpack fov, dbrange, orientation = sim_params
@@ -24,6 +25,7 @@ function saveall(images, beam_energy_map, transmit_time_map, sim_params, output_
         images = mapslices(rotr90, images; dims=[1, 2])
         beam_energy_map = rotr90(beam_energy_map)
         transmit_time_map = rotr90(transmit_time_map)
+        peak_to_peak_time_delta_map = rotr90(peak_to_peak_time_delta_map)
     end
 
     # Wave propagation movie
@@ -67,5 +69,16 @@ function saveall(images, beam_energy_map, transmit_time_map, sim_params, output_
     resize_to_layout!(fig)
     save(joinpath(output_path, transmit_time_map_filename), fig)
 
+    # Peak-to-peak time-delta map
+    peak_to_peak_time_delta_map = peak_to_peak_time_delta_map';
+    fig = Figure()
+    ax = Axis(fig[1, 1], width=size(peak_to_peak_time_delta_map)[1], height=size(peak_to_peak_time_delta_map)[2], xlabel=xlabel, ylabel=ylabel, title="Peak-to-peak time-delta map [µs]")
+    centers_x = range(extent[1], extent[2], length=size(peak_to_peak_time_delta_map)[1])
+    centers_y = range(extent[3], extent[4], length=size(peak_to_peak_time_delta_map)[2])
+    hm = heatmap!(ax, centers_x, centers_y, peak_to_peak_time_delta_map .* 1e6)
+    Colorbar(fig[:, end+1], hm)
+    resize_to_layout!(fig)
+    save(joinpath(output_path, peak_to_peak_time_delta_map_filename), fig)
+
     return  # nothing
 end
diff --git a/src/view.jl b/src/view.jl
index 99fe30a..b67d169 100644
--- a/src/view.jl
+++ b/src/view.jl
@@ -3,18 +3,20 @@ include("colorize_field.jl")
 using ImageView
 using Parameters
 
-function imshowall(images, beam_energy_map, transmit_time_map, sim_params)
+function imshowall(images, beam_energy_map, transmit_time_map, peak_to_peak_time_delta_map, sim_params)
     @unpack dbrange, orientation = sim_params
 
     if orientation == :vertical
         images = mapslices(rotr90, images; dims=[1, 2])
         beam_energy_map = rotr90(beam_energy_map)
         transmit_time_map = rotr90(transmit_time_map)
+        peak_to_peak_time_delta_map = rotr90(peak_to_peak_time_delta_map)
     end
 
     ImageView.imshow(colorize_field(bilog(images, dbrange)))
     ImageView.imshow(bilog(beam_energy_map, dbrange))
     ImageView.imshow(transmit_time_map)
+    ImageView.imshow(peak_to_peak_time_delta_map)
 
     return  # nothing
 end