L_CONSTANT</span><span class="special">(</span><span class="identifier">m_n</span><span class="special">,</span> <span class="identifier">quantity</span><span class="special">&lt;</span> <span class="identifier">mass</span> <span class="special">&gt;</span><span class="special">,</span> 
                               <span class="number">1</span><span class="special">.</span><span class="number">674927211e</span><span class="special">-</span><span class="number">27</span> <span class="special">*</span> kil