pre_text: 28 , 35 , or 90 days . the funds associated with failed auctions will not be accessible until a successful auction occurs or a buyer is found outside of the auction process . based on broker- dealer valuation models and an analysis of other-than-temporary impairment factors , auction rate securities with an original par value of approximately $ 34 million were written-down to an estimated fair value of $ 16 million as of december 31 , 2007 . this write-down resulted in an 201cother-than-temporary 201d impairment charge of approximately $ 8 million ( pre-tax ) included in net income and a temporary impairment charge of $ 10 million ( pre-tax ) reflected as an unrealized loss within other comprehensive income for 2007 . as of december 31 , 2007 , these investments in auction rate securities have been in a loss position for less than six months . these auction rate securities are classified as non-current marketable securities as of december 31 , 2007 as indicated in the preceding table . 3m reviews impairments associated with the above in accordance with emerging issues task force ( eitf ) 03-1 and fsp sfas 115-1 and 124-1 , 201cthe meaning of other-than-temporary-impairment and its application to certain investments , 201d to determine the classification of the impairment as 201ctemporary 201d or 201cother-than-temporary . 201d a temporary impairment charge results in an unrealized loss being recorded in the other comprehensive income component of stockholders 2019 equity . such an unrealized loss does not reduce net income for the applicable accounting period because the loss is not viewed as other-than-temporary . the company believes that a portion of the impairment of its auction rate securities investments is temporary and a portion is other-than-temporary . the factors evaluated to differentiate between temporary and other-than-temporary include the projected future cash flows , credit ratings actions , and assessment of the credit quality of the underlying collateral . the balance at december 31 , 2007 for marketable securities and short-term investments by contractual maturity are shown below . actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties . dec . 31 , ( millions ) 2007 .
post_text: predetermined intervals , usually every 7 .
table: (Millions) Dec. 31, 2007
table: Due in one year or less $231
table: Due after one year through three years 545
table: Due after three years through five years 221
table: Due after five years 62
table: Total marketable securities $1,059
question: Analyse this data from a financial earnings document. what is the percent of the securities due in one year or less to the total balance