public static void exportDocumentConcordanceAsSpreadsheet(DocumentConcordanceTableModel dctm, File f, char sep) throws IOException{
BufferedWriter sb = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(f), "UTF-8"));
sb.append("Document" + sep + "Token" + sep + "Left" + sep + "Target" + sep + "Right\n");
for (int ii = 0; ii < dctm.getRowCount(); ii++) {
DocumentConcordanceLine dcl = dctm.getDocumentConcordanceLine(ii);
String dname = dcl.tokenStructuredDocument.getTitle();
sb.append(doubledoublequote(dname));
sb.append(sep);
sb.append(Integer.toString(dcl.matchingTokenStartIndex));
sb.append(sep);