<div><br></div>Hi<div>The command<br><div>g_sas => <br><div>Select a group for calculation of surface and a group for output</div><div><br></div><div><br></div><div>What is the difference between "a group for calculation of surface" and "a group for output"?</div>
<div>Thank you</div><div>Lin</div></div></div>