*.modelgain

This file is the modal gain for each cavity mode. The format is

M N
Energy(1) modal_gain(mode1) modal_gain(mode2) ... modal_gain(modeN)
Energy(2) modal_gain(mode1) modal_gain(mode2) ... modal_gain(modeN)
...
Energy(M) modal_gain(mode1) modal_gain(mode2) ... modal_gain(modeN)

, where M is the total number of the calculated energy and N is the total number of the cavity modes.