Energy dispersion format

The format to store full-enclosure energy dispersion (see :ref:`iact-edisp`) is the following:

EDISP_2D

The energy dispersion information is saved as a :ref:`fits-arrays-bintable-hdu` with the following required columns.

Columns:

ENERG_LO, ENERG_HI -- ndim: 1, unit: TeV
- True energy axis
MIGRA_LO, MIGRA_HI -- ndim: 1, unit: dimensionless
- Energy migration axis (defined above)
THETA_LO, THETA_HI -- ndim: 1, unit: deg
- Field of view offset axis (see :ref:`coords-fov`)
MATRIX -- ndim: 3, unit: dimensionless
- Energy dispersion dP/d\mu, see :ref:`iact-edisp`.

Recommended axis order: ENERGY, MIGRA, THETA

Header keywords:

As explained in :ref:`hduclass`, the following header keyword should be used to declare the type of HDU:

HDUDOC = 'https://github.com/open-gamma-ray-astro/gamma-astro-data-formats'
HDUVERS = '0.3'
HDUCLASS = 'GADF'
HDUCLAS1 = 'RESPONSE'
HDUCLAS2 = 'EDISP'
HDUCLAS3 = 'FULL-ENCLOSURE'
HDUCLAS4 = 'EDISP_2D'

Example data file: TODO