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 <a id="Table4"></a>
 <h2>Atmosphere to 20 Km by 0.5 Km (SI units)</h2>
 <table>
 <tr>
 <td class="center">alt</td>
 <td class="center">sigma</td>
 <td class="center">delta</td>
 <td class="center">theta</td>
 <td class="center">temp</td>
 <td class="center">pressure</td>
 <td class="center">density</td>
 <td class="center">v sound</td>
 <td class="center">dynamic<br />viscosity</td>
 <td class="center">kinematic<br /> viscosity</td>
 <td class="center">a/nu</td>
 </tr>
