<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:Courier New,courier,monaco,monospace,sans-serif;font-size:12pt;color:#000000;"><span id="result_box" class="long_text"><span style="" title="">Hello PWscf users. </span><span style="" title="">I'm investigating a magnetic system where magnetic coupling (J = E1-E2) is about 0.00001 Ry. </span><span style="" title="">E1 and E2 are the total energies of ferromagnetic and antiferromagnetic configurations, respectively. </span><span style="" title="">I always used to four decimal places the total energy. </span><span style="" title="">Is it correct to use more than four decimal places? </span></span><span id="result_box" class="long_text"><span style="" title="">What is the maximum precision that allows this kind of calculus?</span></span><div> <br>Sincerely,<br><br></div>A. S. Santos<div>Univesidade Federal Fluminense<br>Niter?i-Rio de
Janeiro-Brasil<br></div>
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