}
// Generate a union vector as the center for each cluster.
case UNION_CENTERS:
result = ToolRunner.run(
new UnionClusterPresenceVectors(),
new String[]{clusterOut, centersOut, kmerLen});
if (result < 0) {
System.err.println(UnionClusterPresenceVectors.class.getName() + " failed.");
System.exit(result);