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

Ref CPI and Index Ratios for June 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:                     June 2006
NUMBER OF DAYS IN MONTH:                30

CPI-U (NSA) February 2006               198.7
CPI-U (NSA) March 2006                  199.8
CPI-U (NSA) April 2006                  201.5

Month   Calendar Day    Year    Ref CPI      Index Ratio

June           1       2006    199.80000       1.08785
June           2       2006    199.85667       1.08816
June           3       2006    199.91333       1.08847
June           4       2006    199.97000       1.08878
June           5       2006    200.02667       1.08909
June           6       2006    200.08333       1.08940
June           7       2006    200.14000       1.08970
June           8       2006    200.19667       1.09001
June           9       2006    200.25333       1.09032
June           10      2006    200.31000       1.09063
June           11      2006    200.36667       1.09094
June           12      2006    200.42333       1.09125
June           13      2006    200.48000       1.09156
June           14      2006    200.53667       1.09186
June           15      2006    200.59333       1.09217
June           16      2006    200.65000       1.09248
June           17      2006    200.70667       1.09279
June           18      2006    200.76333       1.09310
June           19      2006    200.82000       1.09341
June           20      2006    200.87667       1.09372
June           21      2006    200.93333       1.09402
June           22      2006    200.99000       1.09433
June           23      2006    201.04667       1.09464
June           24      2006    201.10333       1.09495
June           25      2006    201.16000       1.09526
June           26      2006    201.21667       1.09557
June           27      2006    201.27333       1.09587
June           28      2006    201.33000       1.09618
June           29      2006    201.38667       1.09649
June           30      2006    201.44333       1.09680