// clean results
run("Clear Results");
// get all points
getSelectionCoordinates(xCoordinates, yCoordinates);

// chose name pattern for exporting
fileName = File.openDialog("Select the file for export");

// Exporting as TXT format (ITK compatible)
file = File.open(fileName+".txt");
print(file, "point");
print(file, lengthOf(xCoordinates) );
for(i=0; i<lengthOf(xCoordinates); i++) {
    print(file, xCoordinates[i] + " " + yCoordinates[i]);
}

// export as CSV file
for(i=0; i<lengthOf(xCoordinates); i++) {
    setResult("X", i, xCoordinates[i]);
    setResult("Y", i, yCoordinates[i]);
}
updateResults();
saveAs("Results", fileName+".csv");