Corrected colum names
Missed some in the tests (didn't get caught on  my machine as I didn't have the gammapy-extras path set)
@@ -133,5 +133,5 @@ def test_EffectiveAreaTable2d_write():
offset_lo=offset_lo, offset_hi=offset_hi,
data=data)
hdu = table_to_fits_table(aeff.to_table())
- assert hdu.data['ENERGY_LO'][0].all() == aeff.data.axis('energy').lo.value.all()
+ assert hdu.data['ENERG_LO'][0].all() == aeff.data.axis('energy').lo.value.all()
assert hdu.header['TUNIT1'] == aeff.data.axis('energy').lo.unit
