Predict the form of the cross-peak multiplet that would be seen in a COSY spectrum of an I2S and of an I$S spin system, assuming that the I and S spins are affected by both 90° pulses. [The calculation is simplest if you start with 1z as the equilibrium magnetization, but you should also attempt it starting from z. When predicting the form of the multiplets use the graphical approach illustrated in Fig. 8.10 on page 194.J