bitmap=5; zmin=0; fbox=0   %% Gray scale
xmin=-1e-3; xmax=1e-3      %% Horizontal size = 2 мм
ymin=-1e-3; ymax=1e-3      %% Vertical size = 2 мм
lambda=.6e-6               %% Wavelength = 600 нм
L=6e-2                     %% Distance to source = 6 см
k=2*pi/lambda              %% Wave parameter
f(x,y)=1+cos(k*sqrt(x^2+y^2+L^2))

bitmap=5	bitmap=6 (for digital printing)

 Physical and Mathematical Package "GRAPH"