Order of axes in Edisp IRF

[GernotMaier]

I am trying to understand the axes order in the Edisp IRF compared to all other IRFs with similar axes

For Edisp, we have:

• ENERG_LO, ENERG_HI
• MIGRA_LO, MIGRA_HI
• THETA_LO, THETA_HI
• ...

while for other IRFs, it is (e.g. for PSF_TABLE):

• ENERG_LO, ENERG_HI
• THETA_LO, THETA_HI
• RAD_LO, RAD_HI
• ...

I would suggest to have it always in the order energy, offset axis. Any reasons not the change the order of the axis in Edisp?