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Empirical powers of the adaptive sum-of-powers test (squares) and the tests of Chen et al. (2014) (triangles point up), Cai et al. (2014) (plus signs), Bai & Saranadasa (1996) (crosses), Chen & Qin (2010) (diamonds), and Srivastava & Du (2008) (triangles point down). The signal sparsity parameter 
varies from 
to 
.
