extended ascii delimiters when when writing to outputstream

[brrrdog]

Whenever I write to Response.Output stream after doing a
plain response.write, I get a delimiter between the two
writes that is made up of three extended ascii chars
(decimal equivalents 239, 187, 191). This doesn't seem to
upset the browser but i'm wondering what this sequence is
for? Is there a way to turn it off?
Example: Excuting the following code...
private void Page_Load(objec t sender, System.EventArg s e)
{
XslTransform xslt = new XslTransform();
xslt.Load(Serve r.MapPath("XSLT File1.xslt"));
XmlDataDocument xml = new XmlDataDocument ();
xml.Load(Server .MapPath("XMLFi le1.xml"));
Response.Write( "Before Outputstream");
xslt.Transform( xml.CreateNavig ator
(),null,Respons e.OutputStream) ;
Response.Write( "After outputstream");
}

//yields...
Before Outputstream xslResultsAfter outputstream
//the same thing with the decimal values substituted
for //the extra chars...
<239><187><191> Before
Outputstream<23 9><187><191>xsl ResultsAfter outputstream