diff --git a/testdata/dot-ref/ViewInterfaces.dot b/testdata/dot-ref/ViewInterfaces.dot
index 8d7a94d..c2eaba8 100644
--- a/testdata/dot-ref/ViewInterfaces.dot
+++ b/testdata/dot-ref/ViewInterfaces.dot
@@ -7,16 +7,18 @@
 digraph G {
 	edge [fontname="Helvetica",fontsize=10,labelfontname="Helvetica",labelfontsize=10];
 	node [fontname="Helvetica",fontsize=10,shape=plaintext];
+	nodesep=0.25;
+	ranksep=0.5;
 	// gr.spinellis.iface.classes.FarImplementor
-	c534 [label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> FarImplementor </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=10.0];
+	c534 [label=<<table title="gr.spinellis.iface.classes.FarImplementor" border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> FarImplementor </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=10.0];
 	// gr.spinellis.iface.classes.DirectImplementor
-	c535 [label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> DirectImplementor </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=10.0];
+	c535 [label=<<table title="gr.spinellis.iface.classes.DirectImplementor" border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> DirectImplementor </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=10.0];
 	// gr.spinellis.iface.classes.SubSubFace
-	c537 [label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> &#171;interface&#187; </td></tr><tr><td align="center" balign="center"> SubSubFace </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=10.0];
+	c537 [label=<<table title="gr.spinellis.iface.classes.SubSubFace" border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> &#171;interface&#187; </td></tr><tr><td align="center" balign="center"> SubSubFace </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=10.0];
 	// gr.spinellis.iface.classes.SubFace
-	c538 [label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> &#171;interface&#187; </td></tr><tr><td align="center" balign="center"> SubFace </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=10.0];
+	c538 [label=<<table title="gr.spinellis.iface.classes.SubFace" border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> &#171;interface&#187; </td></tr><tr><td align="center" balign="center"> SubFace </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=10.0];
 	// gr.spinellis.iface.classes.Face
-	c539 [label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p" bgcolor="lemonchiffon"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> &#171;interface&#187; </td></tr><tr><td align="center" balign="center"> Face </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=10.0];
+	c539 [label=<<table title="gr.spinellis.iface.classes.Face" border="0" cellborder="1" cellspacing="0" cellpadding="2" port="p" bgcolor="lemonchiffon"><tr><td><table border="0" cellspacing="0" cellpadding="1"><tr><td align="center" balign="center"> &#171;interface&#187; </td></tr><tr><td align="center" balign="center"> Face </td></tr></table></td></tr></table>>, fontname="Helvetica", fontcolor="black", fontsize=10.0];
 	//gr.spinellis.iface.classes.FarImplementor implements gr.spinellis.iface.classes.SubSubFace
 	c537:p -> c534:p [dir=back,arrowtail=empty,style=dashed];
 	//gr.spinellis.iface.classes.DirectImplementor implements gr.spinellis.iface.classes.Face