estep length on the grid
NOTE: don't use self._dt_code yourself! Use this

Returns
-------
dt : float
    timestep in seconds
</pre> 
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<h2 class="memtitle"><span class="permalink"><a href="#a9a4c5ab4928f822b97ca2b804024010a">&#9670;&nbsp;</a></span>hydro()</h2>

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          <td class="memname">def weltgeist.integrator._Integrator.hydro </td>
          <td>(</td>
 