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Independent sequences of variates can be generated using different base generators for each sequence. For example, sequence 1 can be generated using the NAG basic generator, sequence 2 using the L'Ecuyer's Combined Recursive generator, sequence 3 using the Mersenne Twister. The Wichmann-Hill generator implemented in the ACML is in fact a series of 273 independent generators. The particular sub-generator being used can be selected using the SUBID variable (see DRANDINITIALIZE for details). Therefore, in total, 277 independent streams can be generated with each using an independent generator (273 Wichmann-Hill generators, and 4 additional base generators).