diff --git a/test/prsim_plot.py b/test/prsim_plot.py
index bb53ce8..dad63e3 100755
--- a/test/prsim_plot.py
+++ b/test/prsim_plot.py
@@ -82,6 +82,20 @@ Use -exclude='regex' to specify signals to exclude (or -ex).""")
 	if exclude_given:
 		entries = [e for e in entries if re.search(exclude_re, e[1]) == None]
 
+	# Check if start time given
+	for arg in argv:
+		r = re.findall(r'-t0=(\d+)', arg)
+		if len(r) >= 1:
+			print(f"Filtering by start time t0 = {r[0]}")
+			entries = [e for e in entries if int(e[0]) >= int(r[0])]
+
+	# Check if end time given
+	for arg in argv:
+		r = re.findall(r'-t1=(\d+)', arg)
+		if len(r) >= 1:
+			print(f"Filtering by start time t0 = {r[0]}")
+			entries = [e for e in entries if int(e[0]) <= int(r[0])]
+
 	assert len(entries) >= 1, "No valid entries in prsim.out!"
 
 	# Get list of all sigs and times
@@ -130,7 +144,7 @@ Use -exclude='regex' to specify signals to exclude (or -ex).""")
 
 	# Generate figure
 	# weird sizing is to try to keep "pixel" sizes approx const
-	fig = plt.figure(figsize = (num_sigs/3+0.5,num_times/3+0.2), dpi = 100)
+	fig = plt.figure(figsize = (num_times/3+0.2,num_sigs/3+0.2), dpi = 100)
 
 	image = np.zeros((num_sigs, num_times, 3), dtype = int)
 	image[signals_matrix == 0] = colour_undefined
@@ -173,18 +187,37 @@ Use -exclude='regex' to specify signals to exclude (or -ex).""")
 		else:
 			s1 = s0
 
-
-		arrow_c = "black" if by_val == 1 else "grey"
 		if by_val == 1:
-			plt.arrow(t0, s1, 0, s0-s1 + 0.2*np.sign(s0-s1), head_width = 0.5, width = 0.2, ec = "none", lw = 0, fc = "black", length_includes_head = True)
+			plt.arrow(t0, s1, 0, s0-s1 + 0.2*np.sign(s0-s1), head_width = 0.5, width = 0.2, 
+				ec = "none", lw = 0, fc = "black", length_includes_head = True)
 		else:
-			plt.arrow(t0, s1, 0, s0-s1 + 0.2*np.sign(s0-s1), head_width = 0, width = 0.2, ec = "none", lw = 0, fc = "black", length_includes_head = True)
-			plt.scatter((t0),(s0), c = "black", s = 30)
+			plt.arrow(t0, s1, 0, s0-s1 + 0.2*np.sign(s0-s1), head_width = 0, width = 0.2, 
+				ec = "none", lw = 0, fc = "black", length_includes_head = True)
+			plt.scatter((t0),(s0), c = "black", s = 40)
 	
 	# Write times on x axis
 	for time in unique_times:
 		ax.text(time_to_index(time), num_sigs, time, ha = "center", va = "top", size = 10, rotation = 90)
 
+	# Find and plot wrong Assert statements
+	asserts = re.findall(r"\t *(\d+) .*\nWRONG ASSERT:\t(.+)", f)
+	if len(asserts): print("Failed asserts found!")
+	for a in asserts:
+		print(a)
+		time = int(a[0])
+		index = time_to_index(time)
+		ax.axvline(index+0.5, c = "red", lw = 2)
+		ax.text(index+0.5, -1, a[1], rotation = 90, ha = "center", va = "bottom", c = "red")
+
+	# Find echoed statements of the form "[digits] text"
+	echoes = re.findall(r"\t *(\d+) [^\t]*\n(\[\d+\].+)", f)
+	for a in echoes:
+		time = int(a[0])
+		index = time_to_index(time)
+		c = "xkcd:bright purple"
+		ax.axvline(index+0.5, c = c, lw = 2)
+		ax.text(index+0.5, -1, a[1], rotation = 90, ha = "center", va = "bottom", c = c)
+
 	output_type =  ".pdf"
 	for arg in argv:
 		if arg == "-png": output_type = ".png"