diff --git a/Cantera/python/Cantera/Reactor.py b/Cantera/python/Cantera/Reactor.py
index 1dcfe1df8..5f07e2272 100644
--- a/Cantera/python/Cantera/Reactor.py
+++ b/Cantera/python/Cantera/Reactor.py
@@ -994,7 +994,12 @@ class ReactorNet:
     def time(self):
         """The current time [s]."""
         return _cantera.reactornet_time(self.__reactornet_id)
-    
+
+    def setTolerances(self, rtol = 1.0e-9, atol = 1.0e-20):
+        """Set the relative and absolute error tolerances used in
+        integrating the reactor equations."""
+        _cantera.reactornet_setTolerances(self.__reactornet_id, rtol, atol)
+        
     def advance(self, time):
         """Advance the state of the reactor network in time from the current
         time to time 'time'."""
diff --git a/Cantera/python/ctml_writer.py b/Cantera/python/ctml_writer.py
index fb8101daa..e8a5c97ef 100644
--- a/Cantera/python/ctml_writer.py
+++ b/Cantera/python/ctml_writer.py
@@ -776,6 +776,11 @@ class reaction:
             self._kf = [self._kf]
             mdim += 1
             ldim -= 3
+
+        if self._type == 'edge':
+            if self._beta > 0:
+                electro = kfnode.addChild('electrochem')
+                electro['beta'] = `self._beta`
             
         for kf in self._kf:
 
@@ -917,10 +922,12 @@ class edge_reaction(reaction):
                  equation = '',
                  kf = None,
                  id = '',
-                 order = '',                 
+                 order = '',
+                 beta = 0.0,
                  options = []):
         reaction.__init__(self, equation, kf, id, order, options)
         self._type = 'edge'
+        self._beta = beta
 
 
 #--------------     
@@ -1516,7 +1523,10 @@ validate()
 # $Revision$
 # $Date$
 # $Log$
-# Revision 1.4  2004-07-14 11:24:13  dggoodwin
+# Revision 1.5  2004-09-20 10:25:02  dggoodwin
+# *** empty log message ***
+#
+# Revision 1.4  2004/07/14 11:24:13  dggoodwin
 # *** empty log message ***
 #
 # Revision 1.3  2004/06/09 01:02:31  dggoodwin
diff --git a/Cantera/python/src/ctreactor_methods.cpp b/Cantera/python/src/ctreactor_methods.cpp
index acec23513..5de815f74 100644
--- a/Cantera/python/src/ctreactor_methods.cpp
+++ b/Cantera/python/src/ctreactor_methods.cpp
@@ -492,6 +492,18 @@ py_reactornet_del(PyObject *self, PyObject *args)
     return Py_BuildValue("i",0);
 }
 
+static PyObject*
+py_reactornet_setTolerances(PyObject *self, PyObject *args)
+{
+    int n;
+    double rtol, atol;
+    if (!PyArg_ParseTuple(args, "idd:reactornet_setTolerances", &n, &rtol, &atol))
+        return NULL;
+    int iok = reactornet_setTolerances(n, rtol, atol);
+    if (iok < 0) return reportError(iok);
+    return Py_BuildValue("i",0);
+}
+
 static PyObject*
 py_reactornet_setInitialTime(PyObject *self, PyObject *args)
 {
diff --git a/Cantera/python/src/methods.h b/Cantera/python/src/methods.h
index 37a9de95d..f62b28512 100644
--- a/Cantera/python/src/methods.h
+++ b/Cantera/python/src/methods.h
@@ -196,6 +196,7 @@ static PyMethodDef ct_methods[] = {
     {"flowdev_ready", py_flowdev_ready, METH_VARARGS},
     //{"reactor_setInitialTime", py_reactor_setInitialTime, METH_VARARGS},
     {"reactornet_setInitialTime", py_reactornet_setInitialTime, METH_VARARGS},
+    {"reactornet_setTolerances", py_reactornet_setTolerances, METH_VARARGS},
     {"flowdev_new", py_flowdev_new, METH_VARARGS},
     {"flowdev_massFlowRate", py_flowdev_massFlowRate, METH_VARARGS},
     {"flowdev_del", py_flowdev_del, METH_VARARGS},