diff --git a/IV/Makefile b/IV/Makefile
index e24f672..4cec5ce 100644
--- a/IV/Makefile
+++ b/IV/Makefile
@@ -109,6 +109,8 @@ selfcrossing-1-before_2LINESTYLE = dotted
 selfcrossing-1-before_3SELECT = wm_visuals where name='selfcrossing-1-newline'
 selfcrossing-1-after_WIDTHDIV = 4
 selfcrossing-1-after_1SELECT = wm_debug where name='selfcrossing-1' AND stage='dcrossings' AND gen=1
+selfcrossing-1-after_2SELECT = wm_debug where name='selfcrossing-1' AND stage='bbends' AND gen=1
+selfcrossing-1-after_2LINESTYLE = invisible
 
 .faux_test-integration: tests-integration.sql wm.sql .faux_aggregate-rivers
 	./db -f $<
diff --git a/IV/layer2img.py b/IV/layer2img.py
index b479468..108dd4d 100644
--- a/IV/layer2img.py
+++ b/IV/layer2img.py
@@ -50,8 +50,11 @@ def plot_args(color, maybe_cmap, maybe_linestyle):
     else:
         r = {'color': color}
 
-    if maybe_linestyle:
+    if maybe_linestyle == 'invisible':
+        r['color'] = (0, 0, 0, 0)
+    elif maybe_linestyle:
         r['linestyle'] = maybe_linestyle
+
     return r
 
 def main():