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    "# Outlook\n",
    "\n",
    "The code works pretty well. The iteration approach is quite fast and reliable.\n",
    "\n",
    "There are some outstanding items:\n",
    "\n",
    "* Look into the memory used by the K-D trees, see if it can be further optimized because some copies of data are being made and some of these copies can in theory at least be avoided\n",
    "* Resolve issues where the bounding polygon of a region is not simple (has self-intersection). This happens especially in the case of water at low temperatures. Such self-intersection does not happen in $T$, $\\rho$ coordinates, but does happen in other coordinate sets. The C++ method (https://libgeos.org/doxygen/MakeValid_8h_source.html) is exposed as ``Geometry.make_valid``. It has not been fully implemented into the flashing code.\n",
    "* Automate generation of the bounding polygons in C++. Currently the bounding polygon is generated in Python and passed into C++. To do so will require to implement the melting line models, and additional conversions might be required in [REFPROP-interop](https://github.com/ianhbell/REFPROP-interop)\n",
    "* See if there is a better way to define the bounding edges of the regions. Perhaps splines or something like that might be better, enabling a more efficient representation, not requiring as many points to remap into other coordinates more smoothly."
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