.50% ( 107.50 % ) of the principal amount of the notes plus accrued and unpaid interest , if any ) , with the net cash proceeds of certain public equity offerings within sixty days after the closing of any such offering . the 7.50% ( 7.50 % ) notes rank equally with the 5.0% ( 5.0 % ) convertible notes and its 93 20448% ( 20448 % ) notes and are structurally and effectively junior to indebtedness outstanding under the credit facilities , the ati 12.25% ( 12.25 % ) notes and the ati 7.25% ( 7.25 % ) notes