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SRIM is a software package concerning the stopping and range of ions in matter. Since its introduction in 1985, major upgrades are made about every five years. For SRIM-2003, the following major improvements were made: (1) About 2200 new experimental stopping powers were added to the database, increasing it to over 25,000 stopping values. (2) Improved corrections were made for the stopping of ions in compounds. (3) New heavy ion stopping calculations have led to significant improvements on SRIM stopping accuracy. (4) A self-contained SRIM module has been included to allow SRIM stopping and range values to be controlled and read by other software applications. A full catalog of stopping power plots has been published at www.SRIM.org. Over 500 plots show the accuracy of the stopping and ranges produced by SRIM along with 25,000 experimental data points. References to the citations which reported the experimental data are included.