The SPDR Lehman 1-3 Month T-Bill ( BIL) tracks the Lehman Brothers 1-3 Month U.S. Treasury Bill Index, which is up 1.24% so far this year and has returned an annualized 3.35% over the last three years. The ETF's expense ratio is

The SPDR Lehman Intermediate Term Treasury ( ITE) tracks Lehman's index of Treasury notes with a maturity greater than or equal to one year and less than 10 years. This benchmark is up 1.52% to far this year and has returned an annualized 2.38% over the past three years. The expense ratio is 0.1345%.

The SPDR Lehman Long Term Treasury ( TLO) tracks the index of the same name, which measures the performance U.S. Treasury bonds with a maturity of 10 years or more. So far this year, this index advanced 1.05%, with a three-year annualized return of 3.87%. The expense ratio is 0.1345%

The SPDR Lehman Aggregate Bond's ( LAG) benchmark index of U.S. dollar-denominated investment-grade bonds is up 1.5% this year, and 3.31% annualized for the past three years. The expense ratio is 0.1845%

The SPDR Barclays Capital TIPS ( IPE) tracks the performance of Barclays' index of Treasury bonds whose principal is adjusted to the consumer price index. The benchmark is up 2.43% this year, and it has a 2.95% annualized return for the past three years. The expense ratio is 0.1845%

The fees on State Street's bond ETFs are higher than Vanguard's which carry expense ratios of 0.11%, but lower than those of BGI's, which range from 0.15% to 0.5%.

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