Index: simulation/index.html
===================================================================
--- simulation/index.html	(revision 8652)
+++ simulation/index.html	(revision 8653)
@@ -108,7 +108,7 @@
 <tr>
 	<td> 12_bjt_amp_ac
 	<td> <a href="raw/12_bjt_amp_ac.html"> yes </a>
-	<td> error
+	<td> <a href="raw/12_bjt_amp_ac.html"> yes </a>
 	<td> TODO
 	<td>      sch-rnd: spice pinout with portmap
 	     <br> sim: ac analysis
Index: simulation/raw/06_passive_ac.html
===================================================================
--- simulation/raw/06_passive_ac.html	(revision 8652)
+++ simulation/raw/06_passive_ac.html	(revision 8653)
@@ -83,6 +83,7 @@
 spice/command attribute to:
 <pre>
 print ac vdb(out) zp(out)
+op
 ac dec 10 1 1000k > plot.txt
 </pre>
 <p>
Index: simulation/raw/12_bjt_amp_ac.html
===================================================================
--- simulation/raw/12_bjt_amp_ac.html	(revision 8652)
+++ simulation/raw/12_bjt_amp_ac.html	(revision 8653)
@@ -81,6 +81,7 @@
 spice/command attribute to:
 <pre>
 print ac vdb(out) zp(out)
+op
 ac dec 10 1 1000k > plot.txt
 </pre>
 <p>
Index: simulation/raw/18_opamp_ac.html
===================================================================
--- simulation/raw/18_opamp_ac.html	(revision 8652)
+++ simulation/raw/18_opamp_ac.html	(revision 8653)
@@ -51,6 +51,7 @@
 spice/command attribute to:
 <pre>
 print ac vdb(out) zp(out)
+op
 ac dec 10 1 1000k > plot.txt
 </pre>
 <p>