This graph shows the supply and demand for bonds for Charter Corp. $($S C and D C$)$ and U S Treasury Securities $($S U S and D U S$).$ Two parallel increasing supply curves, S U S and S C$,$ intersect two parallel decreasing demand curves, D U S and D C$.$ Here, $SC$ lies be$-$low $SS,$ and $DC$ lies below D U S$.$ A dashed perpendicular from the vertical axis at P U S meets the point of intersection $($labeled c$)$ of S U S and D U S$.$A dashed perpendicular from the vertical axis at $PC$ meets the point of intersection $($labeled a$)$ of S C and D C$.$ A dashed perpendicular from the horizontal axis also meets the point of inter$-$section $($labeled c$)$ of S U S and D U S$.$ A dashed perpendicular from the horizontal axis also meets the point of intersection $($labeled a$)$ of S C and D C$.$ The price of U S Treasury Securities in this market is PU S$,$ and the price of Charter Corp. bonds in this market is PC$.$ The difference in the bond prices is shown by PU S P C$.$ Since there is an inverse relationship between bond prices and interest rates, a lower price for Charter Corp. bonds means a higher interest rate is being paid.

Complete the sentence. The default risk premium paid by Charter Corp. in this market is represented by: