mperature</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
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<pre class="fragment">Calculate the HII recombination rate
This is the rate at which ionised hydrogen recombines 
  into neutral hydrogen
Total recombinations per second per unit volume = alpha * ne * nH
ne = electron number density
nH = hydrogen number density

Parameters
----------

temperature: float
    Temperature in K

Returns
-------

alpha_B_HII : float
    The recombination rate
</pre> 
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