  Using the isospin dependent quantum molecular dynamics model, we study the
effect of charge asymmetry and isospin dependent cross-section on different
aspects of elliptical flow. Simulations have been carried out for the reactions
of $^{124}X_{m}+^{124}X_{m}$, where m = (47, 50, 53, 57 and 59) and
$^{40}X_{n}+^{40}X_{n}$, where n= (14, 16, 18, 21 and 23). Our study shows that
elliptical flow depend strongly on the isospin of cross-section. The transition
energy remains almost constant with increase in N/Z of the system. A good
agreement is obtained with experimental measurements.
