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@@ -2387,13 +2387,59 @@ needs more than one gas mixture because of the depth or the decompression
 needs of the dive. For this reason multicylinder dives are often used by
 technical divers who dive deep or long. As far as <em>Subsurface</em> is concerned,
 there are only two types of information that need to be provided:</p></div>
-<div class="ulist"><ul>
-<li>
-<p>
-<strong>During the dive, recording cylinder switch events</strong>. Since sidemount diving normally involves two
-  cylinders with air or with the same gas mixture, <em>Subsurface</em> distinguishes among these different
-  cylinders. In contrast, most dive computers that allow gas switching only distinguish among different
-  <em>gases</em> used, not among different <em>cylinders</em> used. This means that when sidemount dives are downloaded
+<div class="ulist"><ul>
+<li>
+<p>
+<strong>Describe the cylinders used during the dive</strong> This is performed in the <strong>Equipment tab</strong> of
+  the <strong>Info</strong> panel, as <a href="#cylinder_definitions">described above</a>. Enter the cylinders one by one,
+  specifying the characteristics of the cylinder and the gas composition within each cylinder.
+</p>
+</li>
+<li>
+<p>
+<strong>Record the times at which switches from one cylinder to another was done:</strong> This is information
+  provided by some dive computers (provided the diver indicated these changes to the dive computer
+  by pressing specific buttons). If the dive computer does not provide the information, the diver has to
+  record these changes using a different method, e.g. writing it on a slate.
+</p>
+</li>
+<li>
+<p>
+<strong>Record the cylinder changes on the dive profile</strong>: If the latter option
+  was followed, the diver needs to indicate the gas change event by right-clicking at the appropriate point
+  in time on the <strong>Dive Profile</strong> panel and indicating the cylinder to which the change was made. After
+  right-clicking, follow the context menu to "Add gas change" and select the appropriate cylinder from
+  those defined during the first step, above (see image below). If the
+  <strong>tank bar</strong> button in the toolbar has been activated, the cylinder switches are also indicated in the
+  tank bar.
+</p>
+</li>
+</ul></div>
+<div class="paragraph"><p>Having performed these tasks, <em>Subsurface</em> indicates the appropriate use of
+cylinders in the dive profile.  Below is a multi-cylinder dive, starting off
+with EAN28, then changing cylinders to EAN50 after 26 minutes to perform
+decompression.</p></div>
+<div class="imageblock" style="text-align:center;">
+<div class="content">
+<img src="images/multicylinder_dive.jpg" alt="FIGURE: Multicylinder profile" />
+</div>
+</div>
+</div>
+<div class="sect3">
+<h4 id="_sidemount_dives">5.6.2. Sidemount dives</h4>
+<div class="paragraph"><p>Sidemount diving is just another form of multicylinder diving, often with
+both or all cylinders having the same gas mixture. Although it is a popular
+configuration for cave divers, sidemount diving can be performed by
+recreational divers who have completed the appropriate training. Sidemount
+dive logging involves, exactly as with multicylinder dives, above, three
+steps:</p></div>
+<div class="ulist"><ul>
+<li>
+<p>
+<strong>During the dive, record cylinder switch events</strong>. Since sidemount diving normally involves two
+  cylinders with air or with the same gas mixture, <em>Subsurface</em> distinguishes among these different
+  cylinders. In contrast, most dive computers that allow gas switching only distinguish among different
+  <em>gases</em> used, not among different <em>cylinders</em> used. This means that when sidemount dives are downloaded
   from these dive computers, the events of switching between cylinders with the same gas are not downloaded. This may mean
   that one may have to keep a written log of cylinder switch times using a slate, or (if the dive computer
   has this facility) marking each cylinder switch with a bookmark that can be retrieved later. Returning
@@ -2428,13 +2474,61 @@ there are only two types of information that need to be provided:</p></div>
 </div>
 </div>
 <div class="paragraph"><p>This section gives an example of the versatility of <em>Subsurface</em> as a dive
-logging tool.</p></div>
-</div>
-<div class="sect3">
-<h4 id="S_CCR_dives">5.6.2. Closed circuit rebreather (CCR) dives</h4>
-<div class="admonitionblock">
-<table><tr>
-<td class="icon">
+logging tool.</p></div>
+</div>
+<div class="sect3">
+<h4 id="S_sSCR_dives">5.6.3. Semi-closed circuit rebreather (SCR) dives</h4>
+<div class="admonitionblock">
+<table><tr>
+<td class="icon">
+<img src="images/halcyon_RB80.jpg" alt="Note" />
+</td>
+<td class="content">Passive semi-closed rebreathers (pSCR) comprise a technical advance in
+diving equipment that recirculates the breathing gas that a diver breathes,
+while removing carbon dioxide from the exhaled gas. While a small amount
+(typically a tenth) of the exhaled breathing gas is released into the water,
+a small amount of fresh gas is released from the back gas cylinder
+(typically containing nitrox).  A diver, using a single cylinder of
+breathing gas can therefore dive for much longer periods than using a
+recreational open-circuit configuration. With pSCR equipment, a very small
+amount of breathing gas is released every time the breather inhales. With
+active SCR (aSCR) equipment, in contrast, a small amount of breathing gas is
+released continuously from the back cylinder.</td>
+</tr></table>
+</div>
+<div class="paragraph"><p>To log pSCR dives, no special procedures are required, just the normal steps
+outlined above:</p></div>
+<div class="ulist"><ul>
+<li>
+<p>
+Select pSCR in the <em>Dive Mode</em> dropdown list on the <strong>Info</strong> panel.
+</p>
+</li>
+<li>
+<p>
+pSCR diving often involves gas changes, requiring an additional cylinder.
+  Define all the appropriate cylinders as described above and indicate the
+  cylinder/gas changes as described above in the section on
+  <a href="#S_MulticylinderDives">multicylinder dives</a>.
+</p>
+</li>
+</ul></div>
+<div class="paragraph"><p>If a pSCR <em>Dive Mode</em> has been selected, the dive ceiling for pSCR dives is
+adjusted for the oxygen drop across the mouthpiece which often requires
+longer decompression periods. Below is a dive profile of a pSCR dive using
+EAN36 on the back cylinder and oxygen for decompression. Note that this dive
+lasted over two hours.</p></div>
+<div class="imageblock" style="text-align:center;">
+<div class="content">
+<img src="images/pSCR_profile.jpg" alt="FIGURE: pSCR profile" />
+</div>
+</div>
+</div>
+<div class="sect3">
+<h4 id="S_CCR_dives">5.6.4. Closed circuit rebreather (CCR) dives</h4>
+<div class="admonitionblock">
+<table><tr>
+<td class="icon">
 <img src="images/APD.jpg" alt="Note" />
 </td>
 <td class="content">Closed system rebreathers use advanced technology to recirculate gas that
@@ -5587,11 +5681,11 @@ dive”.</p></div>
 </div>
 </div>
 </div>
-<div id="footnotes"><hr /></div>
-<div id="footer">
-<div id="footer-text">
-Last updated 2015-02-04 07:41:58 PST
-</div>
-</div>
-</body>
+<div id="footnotes"><hr /></div>
+<div id="footer">
+<div id="footer-text">
+Last updated 2015-02-20 09:40:45 CET
+</div>
+</div>
+</body>
 </html>