Consider the following isotherms at equilibrium for two disperse dyes \( D_1 \) and \( D_2 \) dyed on polyester. If the partition coefficients of these are \( K_1 \) and \( K_2 \), respectively, the value of \( \frac{K_2}{K_1} \text{ is } \underline{\hspace{2cm}}. \)
