.. index:: 
   single: Parameters; 1D Flatness Ratio

1D Flatness Ratio
=================

Dose ratio flatness is the ratio of the maximum profile value to the minimum profile value expressed as a percent taken over the :ref:`in field area<In Field Area>`:

.. math:: 100 \cdot \cfrac {max} {min}
   
Where *max* and *min* are the profile maximum and minimum respectively.

**Protocol invocation name**: 1D Flatness Ratio

|Note| The *max* and *min* may be affected by :ref:`normalisation<Normalisation>` or windowing.

.. |Note| image:: _static/Note.png