<div dir="ltr">Dear all:<div><br></div><div>Now I am trying to use GRID technique in phonon calculations.</div><div>Before performing target calculations, I run the example in PHonon/examples/<span style="font-family:Menlo;font-size:11px">GRID_example/ issuing the command "run_example".</span></div><div><span style="font-family:Menlo;font-size:11px"><br></span></div><div><span style="font-family:Menlo;font-size:11px">Also, I run the same example without GRID technique by slightly changing the scripts.</span></div><div><span style="font-family:Menlo;font-size:11px"><br></span></div><div><span style="font-family:Menlo;font-size:11px">Consequently, I found the slight difference, for example, in </span><span style="font-family:Menlo;font-size:11px">alas.freq file like the following:</span></div><div><span style="font-family:Menlo;font-size:11px"><br></span></div><div><span style="font-family:Menlo;font-size:11px">...</span></div><div><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">271c271</p>
<p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><    45.0003   45.0003  112.3695  370.4536  370.4536  408.8005</p>
<p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">---</p>
<p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">>    45.0108   45.0108  112.3743  370.4534  370.4534  408.8002</p></div><div><span style="font-family:Menlo;font-size:11px"><br></span></div><div><span style="font-family:Menlo;font-size:11px">...</span></div><div><span style="font-family:Menlo;font-size:11px"><br></span></div><div><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">303c303</p>
<p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><    67.5727   67.5727  198.2689  364.5470  364.5470  392.9392</p>
<p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">---</p>
<p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">>    67.5657   67.5657  198.2655  364.5472  364.5472  392.9399</p><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><br></p><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">...</p><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><br></p><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">Is such slight difference usual in GRID phonon calculations?</p><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><br></p><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">Sincerely,</p><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><br></p><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">Jongwon Park</p><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><br></p><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">Hongik Univ. in Korea</p></div></div>