* generation.dat

The output format would be

$N_{\lambda }{N}_y{N}_x$
${\lambda }_1{\lambda }_2{\lambda }_3...{\lambda }_{N_{lambda}}$ 
x y TE_generations  TM_generations (TE+TM)/2_generationrates
x y TE_generations  TM_generations (TE+TM)/2_generationrates
x y TE_generations  TM_generations (TE+TM)/2_generationrates
...
...     ${\lambda }_1$
 $x_{N_x}$ $y_{N_y}$ TE_generations  TM_generations (TE+TM)/2_generationrates
$x_1$ $y_1$ TE_generations  TM_generations (TE+TM)/2_generationrates
$x_2$ $y_2$ TE_generations  TM_generations (TE+TM)/2_generationrates
$x_3$ $y_3$ TE_generations  TM_generations (TE+TM)/2_generationrates
...
...     ${\lambda }_2$
 $x_{N_x}$ $y_{N_y}$ TE_generations  TM_generations (TE+TM)/2_generationrates
$x_1$ $y_1$ TE_generations  TM_generations (TE+TM)/2_generationrates
$x_2$ $y_2$ TE_generations  TM_generations (TE+TM)/2_generationrates
$x_3$ $y_3$ TE_generations  TM_generations (TE+TM)/2_generationrates
...
...     ${\lambda }_3$
 $x_{N_x}$ $y_{N_y}$ TE_generations  TM_generations (TE+TM)/2_generationrates
$x_1$ $y_1$ TE_generations  TM_generations (TE+TM)/2_generationrates
$x_2$ $y_2$ TE_generations  TM_generations (TE+TM)/2_generationrates
$x_3$ $y_3$ TE_generations  TM_generations (TE+TM)/2_generationrates
...
...     ${\lambda }_{N_{\lambda }}$
 $x_{N_x}$ $y_{N_y}$ TE_generations  TM_generations (TE+TM)/2_generationrates