function [psi] = setupWavefunction(~,Params,Transf)

    X        = Transf.X; 
    Y        = Transf.Y;
    
    ellx     = sqrt(Params.hbar/(Params.m*Params.wx))/Params.l0; 
    elly     = sqrt(Params.hbar/(Params.m*Params.wy))/Params.l0;
    
    Rx       = 4*sqrt(2)*ellx; 
    Ry       = 4*sqrt(2)*elly;
    X0       = 0.0*Transf.Xmax; 
    Y0       = 0.0*Transf.Ymax;
    
    psi = exp(-(X-X0).^2/Rx^2-(Y-Y0).^2/Ry^2);
    cur_norm = trapz(abs(psi(:)).^2)*Transf.dx*Transf.dy;
    psi = psi/sqrt(cur_norm);
    
    Norm = trapz(abs(psi(:)).^2)*Transf.dx*Transf.dy;
    psi = sqrt(Params.N)*psi/sqrt(Norm);

end