<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <meta content="text/html; charset=ISO-8859-1"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#ccccff" text="#000000">
    I think this format is very similar to the electron density map file
    <a
href="http://www.pasteur.fr/recherche/unites/Binfs/xplor/manual/node312.html#SECTION001530000000000000000">xplor
      format</a> or <a
href="http://cdnetworks-kr-1.dl.sourceforge.net/project/discus/Manuals/kupl_man.pdf">that
      one</a> page 22.<br>
    I may have routines to read those files somewhere. <br>
    Give me some time to get them and I will send them to you by
    tomorrow if I find them.<br>
    Yours, <br>
    <br>
    <br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Eric.<br>
    <h1><br>
    </h1>
    <br>
    On 04/06/2011 10:36 AM, Tone Kokalj wrote:
    <blockquote cite="mid:1302100573.3296.17.camel@catalyst.ijs.si"
      type="cite">
      <pre wrap="">On Mon, 2011-04-04 at 16:25 -0300, <a class="moz-txt-link-abbreviated" href="mailto:jorge.gallardo@cab.cnea.gov.ar">jorge.gallardo@cab.cnea.gov.ar</a> wrote:
</pre>
      <blockquote type="cite">
        <blockquote type="cite">
          <pre wrap="">you can extract the charge density (with pp.x) in a number of different
formats. For the relation between indices and positions in real space:
<a class="moz-txt-link-freetext" href="http://www.quantum-espresso.org/user_guide/node23.html">http://www.quantum-espresso.org/user_guide/node23.html</a>

</pre>
        </blockquote>
        <pre wrap="">
thank you for you response.

I tried to do something like that, but I cannot understand the content of
the file "al.rho.dat". I suppose that the density is in the big block of 6
numerical columns "DATAGRID_3D_UNKNOWN", but, How is ordered that block? ,
In what order should I read it?.
</pre>
      </blockquote>
      <pre wrap="">
I would suggest you follow the hint of Paolo, nevertheless, here is the
order of how the datagrid is written:

write(*,*) (((value(ix,iy,iz),ix=1,nx),iy=1,ny),iz=1,nz)

for more specs, see: 
<a class="moz-txt-link-freetext" href="http://www.xcrysden.org/doc/XSF.html">http://www.xcrysden.org/doc/XSF.html</a>

Regards, Tone

</pre>
    </blockquote>
    <br>
    <div class="moz-signature">-- <br>
      <center>
        <font color="#946e8c">
          <em>
            Be the change you wish to see in the world<br>
          </em>
          <small>
            <font color="#946e8c">
              &#8212; Mahatma Gandhi &#8212;<br>
            </font></small>
          <br>
          <a href="mailto:germaneau@gucas.ac.cn">Dr. &Eacute;ric Germaneau</a><br>
          <br>
          College of Physical Sciences<br>
          Graduate University of Chinese Academy of Sciences<br>
          Yuquan Road 19A<br>
          Beijing 100049<br>
          China<br>
          <br>
          <small>
            <em>
              <font style="color: rgb(73, 136, 72);" face="Times">
                Please, if possible, don't send me MS Word or PowerPoint
                attachments<br>
                Why? See: <a
                  href="http://www.gnu.org/philosophy/no-word-attachments.html"
                  style="text-decoration: none;"><font color="#498848">http://www.gnu.org/philosophy/no-word-attachments.html</font></a>
              </font></em>
          </small>
        </font></center>
    </div>
  </body>
</html>