[xsl] I output a tab character, then the output file contains space, tab

Hi Folks,

In the below XSLT program I loop over each value in a sequence and separate the 
sequence values by a tab (hex 9) character. When I open the output file in a 
hex editor I see 3 characters separating the sequence values: space (hex 20), 
tab (hex 9), and space (hex 20). Why am I getting those space characters? How 
do I avoid getting them?  /Roger

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
                           version="2.0">
    
    <xsl:output method="text" />
    
    <xsl:variable name="headers" select="('A', 'B')"/>
    <xsl:variable name="field-separator" select="codepoints-to-string(9)"/>
    
    <xsl:template match="/">
        <xsl:for-each select="$headers">
            <xsl:sequence select="." />
            <xsl:sequence select="$field-separator"/>
        </xsl:for-each>
    </xsl:template>
    
</xsl:stylesheet>
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