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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for February 2006

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            Series C-2013
CUSIP NUMBER:                           912828BD1
DATED DATE:                             July 15, 2003
ORIGINAL ISSUE DATE:                    July 15, 2003
ADDITIONAL ISSUE DATE:                  October 15, 2003
MATURITY DATE:                          July 15, 2013
Ref CPI on DATED DATE:                  183.66452
TABLE FOR MONTH OF:                     February 2006
NUMBER OF DAYS IN MONTH:                28

CPI-U (NSA) October 2005                199.2
CPI-U (NSA) November 2005               197.6
CPI-U (NSA) December 2005               196.8

Month    Calendar Day    Year    Ref CPI       Index Ratio

February        1        2006    197.60000       1.07587
February        2        2006    197.57143       1.07572
February        3        2006    197.54286       1.07556
February        4        2006    197.51429       1.07541
February        5        2006    197.48571       1.07525
February        6        2006    197.45714       1.07510
February        7        2006    197.42857       1.07494
February        8        2006    197.40000       1.07479
February        9        2006    197.37143       1.07463
February        10       2006    197.34286       1.07447
February        11       2006    197.31429       1.07432
February        12       2006    197.28571       1.07416
February        13       2006    197.25714       1.07401
February        14       2006    197.22857       1.07385
February        15       2006    197.20000       1.07370
February        16       2006    197.17143       1.07354
February        17       2006    197.14286       1.07339
February        18       2006    197.11429       1.07323
February        19       2006    197.08571       1.07307
February        20       2006    197.05714       1.07292
February        21       2006    197.02857       1.07276
February        22       2006    197.00000       1.07261
February        23       2006    196.97143       1.07245
February        24       2006    196.94286       1.07230
February        25       2006    196.91429       1.07214
February        26       2006    196.88571       1.07199
February        27       2006    196.85714       1.07183
February        28       2006    196.82857       1.07167