The tarfile name is encoded in this manner: atlas<version #>_<OS>_<arch>.tgz
Each tarfile will create a subdirectory roughly corresponding to the <OS>_<arch> string. The included README file provides usage details.
file atlas3.6.0_Linux_P4SSE2.tgz for Intel P4, using SSE2 for all precisions size 1221682 file atlas3.6.0_Linux_HAMMER64SSE2_2.tgz for AMD Opteron and Athlon-64, 2 processors size 1325774 file atlas3.6.0_Linux_HAMMER64SSE2.tgz for AMD Opteron and Athlon-64, optimized for uniprocessor size 1197581 file atlas3.5.1_Linux_PPCG4AltiVec_2.tgz for Apple G4/G4e PowerPC with AltiVec, 1-2 processors size 1736945 file atlas3.6.0_Linux_PIIISSE1.tgz for Intel Pentium III, 256K L2 cache size 971716 file atlas3.4.1_Linux_ATHLON.tgz for AMD Athlon, 256K L2 cache size 882415 file atlas3.4.1_Linux_IA64Itan_2.tgz for Dual processor libs for Intel Itanium size 831836 file atlas3.4.1_Linux_PIIISSE1.tgz for Intel PIII, with 256K L2 cache, using SSE1 for single precision size 938576