Index: palm/trunk/DOC/app/chapter_4.2.html
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--- palm/trunk/DOC/app/chapter_4.2.html	(revision 61)
+++ palm/trunk/DOC/app/chapter_4.2.html	(revision 72)
@@ -377,5 +377,5 @@
 "ncdump -c &lt;filename&gt;". See chapter <a href="chapter_4.5.1.html">4.5.1</a> about processing
 the PALM NetCDF data.<br><br>The following quantities are
-available for output by default:<br><br><table style="text-align: left; width: 576px; height: 481px;" border="1" cellpadding="2" cellspacing="2"><tbody><tr><td style="width: 106px;"><span style="font-weight: bold;">quantity
+available for output by default (quantity names ending with '*' are only allowed for the output of horizontal cross sections):<br><br><table style="text-align: left; width: 576px; height: 481px;" border="1" cellpadding="2" cellspacing="2"><tbody><tr><td style="width: 106px;"><span style="font-weight: bold;">quantity
 name</span></td><td style="width: 196px;"><span style="font-weight: bold;">meaning</span></td><td><span style="font-weight: bold;">unit</span></td><td><span style="font-weight: bold;">remarks</span></td></tr><tr><td style="width: 106px;"><span style="font-style: italic;">e</span></td><td style="width: 196px;">SGS TKE</td><td>m<sup>2</sup>/s<sup>2</sup></td><td></td></tr><tr><td style="width: 106px; vertical-align: top;"><span style="font-style: italic;">lwp*</span></td><td style="width: 196px; vertical-align: top;">liquid water path</td><td style="vertical-align: top;">m</td><td style="vertical-align: top;">only horizontal cross section
 is allowed,&nbsp;requires <a href="chapter_4.1.html#cloud_physics">cloud_physics</a>
@@ -388,5 +388,9 @@
 particle/droplet radius </td><td style="vertical-align: top;">m</td><td style="vertical-align: top;">requires that particle
 advection is switched on by <span style="font-weight: bold;">mrun</span>-option
-"-p particles"</td></tr><tr><td style="width: 106px; vertical-align: top;"><span style="font-style: italic;">pt</span></td><td style="width: 196px; vertical-align: top;">potential
+"-p particles"</td></tr><tr><td style="vertical-align: top;"><span style="font-style: italic;">pra*</span></td><td style="vertical-align: top;">precipitation amount</td><td style="vertical-align: top;">mm</td><td style="vertical-align: top;">only horizontal cross section
+is allowed,&nbsp;requires&nbsp;<a href="chapter_4.1.html#precipitation">precipitation</a>
+= <span style="font-style: italic;">.TRUE., </span>time interval on which amount refers to is defined by <a href="#precipitation_amount_interval">precipitation_amount_interval</a></td></tr><tr><td style="vertical-align: top;"><span style="font-style: italic;">prr*</span></td><td style="vertical-align: top;">precipitation rate</td><td style="vertical-align: top;">mm/s</td><td style="vertical-align: top;">only horizontal cross section
+is allowed,&nbsp;requires&nbsp;<a href="chapter_4.1.html#precipitation">precipitation</a>
+= <span style="font-style: italic;">.TRUE.</span></td></tr><tr><td style="width: 106px; vertical-align: top;"><span style="font-style: italic;">pt</span></td><td style="width: 196px; vertical-align: top;">potential
 temperature<br></td><td style="vertical-align: top;">K</td><td style="vertical-align: top;"></td></tr><tr><td style="width: 106px; vertical-align: top;"><span style="font-style: italic;">q</span></td><td style="width: 196px; vertical-align: top;">specific humidity
 (or total water content, if cloud physics is switched on)</td><td style="vertical-align: top;">kg/kg</td><td style="vertical-align: top;">requires <a href="chapter_4.1.html#moisture">moisture</a> = <span style="font-style: italic;">.TRUE.</span></td></tr><tr><td style="width: 106px; vertical-align: top;"><span style="font-style: italic;">ql</span></td><td style="width: 196px; vertical-align: top;">liquid water
@@ -411,5 +415,5 @@
 the velocity</td><td style="vertical-align: top;">m/s</td><td style="vertical-align: top;"></td></tr><tr><td style="width: 106px; vertical-align: top;"><span style="font-style: italic;">vpt</span></td><td style="width: 196px; vertical-align: top;">virtual potential
 temperature</td><td style="vertical-align: top;">K</td><td style="vertical-align: top;">requires <a href="chapter_4.1.html#moisture">moisture</a> = <span style="font-style: italic;">.TRUE.</span></td></tr><tr><td style="width: 106px; vertical-align: top;"><span style="font-style: italic;">w</span></td><td style="width: 196px; vertical-align: top;">w-component of
-the velocity</td><td style="vertical-align: top;">m/s</td><td style="vertical-align: top;"></td></tr></tbody></table><br>Multiple
+the velocity</td><td style="vertical-align: top;">m/s</td><td style="vertical-align: top;"></td></tr><tr><td style="vertical-align: top;"><span style="font-style: italic;">z0*</span></td><td style="vertical-align: top;">roughness length</td><td style="vertical-align: top;">m</td><td></td></tr></tbody></table><br>Multiple
 quantities can be assigned, e.g. <span style="font-weight: bold;">data_output</span>
 = <span style="font-style: italic;">'e'</span>, <span style="font-style: italic;">'u'</span>, <span style="font-style: italic;">'w'</span>.<br><br>By
@@ -1595,5 +1599,10 @@
 </p> <p>For runs with constant eddy diffusivity (see <a href="chapter_4.1.html#km_constant">km_constant</a>),
 this parameter can be used to assign the Prandtl number (ratio K<sub>m</sub>
-/ K<sub>h</sub>).</p> </td> </tr> <tr>
+/ K<sub>h</sub>).</p> </td> </tr> <tr><td style="vertical-align: top;"><a name="precipitation_amount_interval"></a><span style="font-weight: bold;">precipitation_amount_</span><br style="font-weight: bold;"><span style="font-weight: bold;">interval</span></td><td style="vertical-align: top;">R</td><td style="vertical-align: top;"><i>value of
+&nbsp;<a href="chapter_4.2.html#dt_do2d_xy">dt_do2d_<br>xy</a></i></td><td style="vertical-align: top;"><p lang="en-GB"><font face="Thorndale"><font face="Thorndale, serif">Temporal
+interval</font> for which the precipitation amount (in mm) shall be calculated and output (</font>in <font face="Thorndale">s).&nbsp;
+</font> </p> <p><span lang="en-GB"></span><a href="chapter_4.2.html#data_output"><span lang="en-GB"></span></a><span lang="en-GB"></span><a href="chapter_4.2.html#section_xy"><span lang="en-GB"></span></a><span lang="en-GB"><font face="Thorndale">This
+parameter requires <a href="chapter_4.1.html#precipitation">precipitation</a> = <span style="font-style: italic;">.TRUE.</span>.&nbsp;</font></span><span lang="en-GB"></span><span lang="en-GB"><font face="Thorndale"><span style="font-weight: bold;"></span><span style="font-weight: bold;"></span>The interval must be smaller or equal than the output interval for 2d horizontal cross sections given by </font></span><a href="chapter_4.2.html#dt_do2d_xy"><span lang="en-GB"><font face="Thorndale">dt_do2d_xy</font></span></a><span lang="en-GB"><font face="Thorndale">). The output of the precipitation amount also requires setting of <a href="chapter_4.2.html#data_output">data_output</a> =<span style="font-style: italic;"> 'pra*'</span>.<br>
+</font></span></p> <span lang="en-GB"></span></td></tr><tr>
 <td style="vertical-align: top;"> <p><a name="profile_columns"></a><b>profile_columns</b></p>
 </td> <td style="vertical-align: top;">I</td>
