# distance form source to screen
dist    0.2
# screen
#       x-min           y-min           x-max           y-max
screen  -0.4            -0.4            0.4             0.4

# picture
picture 1000            1000

# wavelength
lambda  1e-6

# sources
#       x-pos           y-pos           amplitude
source	-2.500e-06	-2.500e-06	1.000e+00
source	2.500e-06	-2.500e-06	1.000e+00
source	-2.500e-06	2.500e-06	1.000e+00
source	2.500e-06	2.500e-06	1.000e+00