<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><span>Attached is the code used. It works well on Centos.</span></div><div><span><br></span></div><div><span>It seems related to the "OAPF"; without it, the picking is OK.</span></div><div> </div><div>-----</div><div>Zhouchuan Huang, Ph.D. <br>School of Earth Sciences and Engineering<br>Nanjing University<br>Nanjing 210093, China <br>Tel: +86-13675137130<br>Email: <a rel="nofollow" target="_blank" href="mailto:zhouchuan.huang@gmail.com">zhouchuan.huang@gmail.com</a></div></div></body></html>