[m n]=size(mu)
absorption=mu*100; % in m-1 , to be consistant with lambda!! /10 to have less attenuation
beta=(lambda/(4*pi))*absorption; % one slice of beta /!\ units
[m n]=size(mu)
absorption=mu*100; % in m-1 , to be consistant with lambda!! /10 to have less attenuation
beta=(lambda/(4*pi))*absorption; % one slice of beta /!\ units