A diagonal spread is created by buying a call with strike price $K_2$ and exercise date $T_2$ and selling a call with strike price $K_1$ and exercise date $T_1$, where $T_2>T_1$. Draw a diagram showing the profit from the spread at time $T_1$ when (a) $K_2>K_1$ and (b) $K_2<K_1$.