T = 0.5 + 4.0*np.cos(l) + 1.0*np.sin(l)
l = np.linspace(0.5,6.,101)
pl.plot(l,T,'k',theta,data,'o')
pl.xlabel('X')
pl.ylabel('Y')
pl.title('Linear Least Squares Example')
pl.grid('on')
pl.axis([0,7,-4,5])