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@@ -2676,9 +2676,13 @@ need to be explicit.</p>
 for. This is what we write as quantities in most of the physical equations. This is why we
 will not need any specifier to denote them.</p>
 <p>For example:</p>
-<div class="language-cpp highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="n">quantity</span><span class="o">&lt;</span><span class="n">point</span><span class="o">&lt;</span><span class="n">isq</span><span class="o">::</span><span class="n">mass</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">m1</span><span class="p">(</span><span class="mi">10</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">kg</span><span class="p">);</span><span class="w">   </span><span class="c1">// point quantity with an implicit point origin</span>
-</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="n">quantity</span><span class="o">&lt;</span><span class="n">isq</span><span class="o">::</span><span class="n">mass</span><span class="o">&gt;</span><span class="w">        </span><span class="n">m2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">15</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">kg</span><span class="p">;</span><span class="w">  </span><span class="c1">// absolute quantity (e.g., non-negative)</span>
-</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="n">quantity</span><span class="o">&lt;</span><span class="n">delta</span><span class="o">&lt;</span><span class="n">isq</span><span class="o">::</span><span class="n">mass</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">m3</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">m1</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">m2</span><span class="p">;</span><span class="w">  </span><span class="c1">// delta quantity (e.g., may be negative)</span>
+<div class="language-cpp highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">tare</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">relative_point_origin</span><span class="o">&lt;</span><span class="n">quantity_point</span><span class="p">{</span><span class="mi">2</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">kg</span><span class="p">}</span><span class="o">&gt;</span><span class="w"> </span><span class="p">{}</span><span class="w"> </span><span class="n">tare</span><span class="p">;</span>
+</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>
+</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="n">quantity</span><span class="o">&lt;</span><span class="n">point</span><span class="o">&lt;</span><span class="n">isq</span><span class="o">::</span><span class="n">mass</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">m1</span><span class="p">(</span><span class="mi">10</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">kg</span><span class="p">);</span><span class="w">          </span><span class="c1">// point quantity with an implicit point origin</span>
+</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="n">quantity</span><span class="o">&lt;</span><span class="n">point</span><span class="o">&lt;</span><span class="n">isq</span><span class="o">::</span><span class="n">mass</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">m2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">tare</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">8</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">kg</span><span class="p">;</span><span class="w">   </span><span class="c1">// point quantity with an explicit relative point origin</span>
+</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="n">quantity</span><span class="o">&lt;</span><span class="n">isq</span><span class="o">::</span><span class="n">mass</span><span class="o">&gt;</span><span class="w">        </span><span class="n">m3</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">15</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">kg</span><span class="p">;</span><span class="w">         </span><span class="c1">// absolute quantity (e.g., non-negative)</span>
+</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="n">quantity</span><span class="o">&lt;</span><span class="n">delta</span><span class="o">&lt;</span><span class="n">isq</span><span class="o">::</span><span class="n">mass</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">m13</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">m1</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">m3</span><span class="p">;</span><span class="w">        </span><span class="c1">// delta quantity (e.g., may be negative)</span>
+</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="n">quantity</span><span class="o">&lt;</span><span class="n">delta</span><span class="o">&lt;</span><span class="n">isq</span><span class="o">::</span><span class="n">mass</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">m23</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">m2</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">m3</span><span class="p">;</span><span class="w">        </span><span class="c1">// delta quantity (e.g., may be negative)</span>
 </span></code></pre></div>
 <p>With the above, the previous examples may be refactored to:</p>
 <div class="language-cpp highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="n">quantity</span><span class="w"> </span><span class="n">m1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">kg</span><span class="p">;</span>